Blooper

A blooper is pretty much any mistake, whether it be continuity, a misspoken line or typo, a wrong sound or special effect, some kind of malfunction in the equipment, etc. There are a few specific Sub Tropes for this.

Can be done in Real Life or a Show Within a Show.

They can involve: 
 * An actor flubbing a line.
 * Someone tripping on the set.
 * Part of the set collapsing.
 * Funny animal stuff.
 * Spontaneous laughter, known as "Corpsing"
 * The special effects don't work as intended or break
 * An animation frame does not match the rest for a few seconds.

These often show up in the main cut, but are of course usually edited out. When a blooper turns out to be a good scene, the directors sometimes Throw It In.

In the film and television industry, bloopers are not always appreciated: some actors have no problem with having their goofups displayed, while others find the slips embarassing, and ask that blooper reels not be released publicly.

A Super Trope to Hilarious Outtakes (the bloopers are compiled in a reel shown outside the main work).

Not to be confused with the squid from Super Mario Bros

Anime and Manga

 * In the last battle of Magical Girl Lyrical Nanoha As, when Vita activates Graf Eisen, Kaiji Tang unintentionally said "SCHWING!" This even made it into the English dub (See 1:01, spoilers in link).
 * In the 2001 Cyborg 009 series's London episode, 004 is shown firing a Ray Gun alongside the other Cyborgs. Problem is, the very first episode had 004 giving the gun in his possession to a disarmed 009 since he didn't need it - the guy is already a walking arsenal, and he's got pretty effective Arm Cannons. So... whoops to the animation team that forgot he doesn't need guns?
 * Tytania, episode 2. Up to 11:30, Idris is standing beside Salisch. The scene shifts for a moment, then comes back at 11:45 to show him sitting down while Salisch remains standing. 3 seconds later at 11:48, he's standing again.
 * In volume 2 of Rose of Versailles, Marie's cape . Unless you think she could move yards of velvet, Jewelry, and ermine in the space of a few seconds.

Film
"Lord Beckett: *after having forgotten a line* "Oh, *bleep*."
 * Just look at MovieMistakes.com.
 * There's a hard-to-catch one in Star Wars Episode IV: A New Hope: Right after returning from the big final battle, Luke runs up to Princess Leia and Mark Hamill yells, "Carrie!" (the actress' name) instead of "Leia!"
 * Lest we forget the infamous stormtrooper banging his head on the door scene in A New Hope.
 * It was even carried into Episode II, where Jango hits his head on the closing door of the Slave I.
 * Let's not claim that any blooper is hard to catch in Star Wars, because according to this page, there are 259 mistakes in A New Hope alone.
 * The Rocky Horror Picture Show has a sequence where Frank runs his finger down Rocky's chest while singing "ste-e-e-eam". During the utterance, a beep can be heard--someone accidentally bumped a synthesizer while mixing the music (this occurs during the song "Charles Atlas")
 * Plan Nine From Outer Space is notorious for this. It has so many bloopers that listing them all would require a whole page.
 * It could be argued that the film is just one long blooper.
 * The reason for this is that Ed Wood never did retakes. Thus, you get goofs like the gravestone being knocked over. And it didn't help that some of the actors were deliberately creating them, just to prod Ed Wood into saying "cut". (He didn't.)
 * Peter Jackson's Lord of the Rings had a few. Just two examples from the third film: When the Nazguls descend on the city, you can count them and there are clearly 10 of them instead of 9. When Aragorn is holding his epic speech, the camera slides over the army a few times. One particular soldier who shows up at least twice on the screen is clearly wearing glasses.
 * The first Jurassic Park has a hard-to-spot one, in the famous T-Rex scene of all places. Watch the door on the truck that the kids are in - when the POV is inside or near the vehicle, the driver's door is open, but when shown from the other car behind, the door is shut. It closes and re-opens off-camera twice before closing for good on-camera.
 * Though Jurassic Park has two of the best bloopers ever. When the car rolls over, you can in one shot see the wire holding the car, a stage-light and a potted plant in the back. The other one is just when the raptors enter the kitchen where you can see a hand wobble one around.
 * And let's not forget that since they cut the shot where she grabs it from the movie itself(it's in the theatrical trailer on the DVD, though), at the end of the Jeep ride near the beginning of the film, Ellie suddenly has an exotic(and according to her, extinct) leaf in her hands from out of nowhere.
 * In Beetlejuice there's an Egregious one: watch Otto's shoes changing from moccasines to sneakers and back, as he inspects the house for the first time.
 * In The Wiggles Magical Adventure Captain Feathersword accidentally bumps the breast of another pirate. It's a tiny little blooper (if she had been wearing a solid color rather than the stripes, no one would have ever noticed), but of the sort that once you have seen it it's hard not to notice it every time - especially because the pirate reacts to something Feathersword let slip, but it's easy after to wonder if she's reacting to the bump.
 * Pirates of the Caribbean has many wonderful outtakes, including (but not limited to):
 * Johnny Depp breaking script without breaking character

Captain Jack Sparrow: "Ah! You can't curse in a Disney film, mate." *aside* "I told him.""


 * Keira Knightley making faces.
 * The many, many takes it took Elizabeth and Barbossa to perfect the swords tossed up through cracks in the floor catching shot.
 * An exterior scene in the 1983 televised version of Star Trek the Motion Picture which someone had added in without noticing it hadn't been finished.
 * Showdown in Little Tokyo had at least two. The first one is when Dolph Lundgren's character jumps over a car. He is shown standing by the side of the car and uses a spring to catapult himself. The second one is when he shoots a pipe to have the steam inside it distract bad guys. A random man can clearly be seen sitting next to Dolph with a extinguisher and then using it.
 * An American Werewolf in London has a small but noticeable continuity slip as Dr. Hirsch's beer gets fully refilled for a final sip in the pub.
 * In one part of Disney's Babes in Toyland, when Barnaby and his cohorts walk through the town to get everybody's attention, an extra accidentally closes her dress in the door and it's visible.

Live Action TV
"Robert Bruce said, "as long as a hundred men remain alive-" Oh God, I've stalled the car... Robert Bruce never stalled his car! Look, there's a learner driver behind us! Oh to be a fly on the wall in that car: (silly voice) "Now, Reginald, I hope you're watching that idiot. If I ever catch you doing a thing like that, I'll have you struck off...""
 * Bloopers are often collected for TV specials or videos.
 * The Dick Clark - Ed McMahon series T vs. Bloopers and Practical Jokes.
 * Gilmore Girls often features this in regards to an episode's setting, especially since one of the main plot points is that Lorelai and Rory had to have dinner with Emily and Richard every Friday night.
 * An extremely rare tear-jerking variation: in the Angel episode "I Will Remember You", when Angel tells Buffy time will be reversed and their day of perfect happiness together will be undone, Buffy starts crying. When Angel comforts her, David Boreanaz is clearly heard calling Sarah Michelle Gellar by her real name, instead of her character's name.
 * This is kind of a CMOH, because Gellar was/is a firm believer in the Angel/Buffy pairing and the scene was causing her to genuinely tear up.
 * Being unscripted for the most part, Billy Connolly's world tour of Scotland naturally included the bloopers: one notable one was when Billy's car stalled while he was giving a speech on Robert Bruce.


 * The Dutch comedians Rooyakkers, Kamps & Kamps parodied this by redoing sketches from their show as an encore, only to deliberately screw them up.
 * Many of the First Doctor's episodes on Doctor Who included fluffs, as the budget was so limited and the schedule so hasty that they couldn't afford or have time to re-shoot the scenes.
 * Listing all the bloopers in Doctor Who would require it's own page. Not counting visible strings holding up models, we get Daleks bumping into the camera, the Monster of the Week finally rising from his throne (only to reveal a stagehand's hand holding down the seat), boom mikes in the shot, and a production assistant standing in the wrong place and getting into the background. Some bloopers are so (in)famous that the 2005 production team threw a CGI monster accidentally bumping into the camera as a tip of the hat.
 * The Carol Burnett Show would have them aired if neither take came out right.
 * Often left in on the show Hee Haw (as the bloopers were often funnier than the jokes!).

Professional Wrestling

 * Presenting Botchamania
 * Since Botchamania is constantly on the run from copyright law, leaping from one YouTube account to another, let's list some examples anyway!
 * Booker T getting a little too involved in his interview: "Hulk Hogan! We comin' for you, nigga!"
 * Big Show not paying attention in an interview and referring to Kai En Tai as "those two gooks."
 * Owen Hart once claimed he kicked his brother Bret's "leg out from his leg!"

Video Games

 * In Dead Rising, the death of the Clown boss involves him falling on his two chainsaws. Yet when he is falling, the saws are held outward, not inward. Of course, seeing him fall on them is Rule of Scary, but it wouldn't have hurt to make sure he was holding them the right way when he fell over.
 * Metal Gear Solid 3: Snake Eater has a whole lot. this Youtube channel features some of them.
 * A strong one happened in Oblivion's expansion, Shivering Isles.
 * Putt Putt: Pep's Birthday Surprise has a lot of bugs you'd think they'd easily catch in beta testing. One of these is during a minigame where you have to get five bunnies into a magicians hat. Sometimes, the spawn off-screen, and your only choice is to exit and re-enter the game.
 * The first Pajama Sam game had one in the 2002 re-release. One of the click points in a dancing room is a poster covered up by a couch. When one of the animations plays, it overlaps the couch. This didn't exist in the original, so it's baffling how it would be there.

Web Original

 * In The Nostalgia Chick's Bratz episode, when the Critic is reasoning with her about why he made her do the movie, he pushes the door and she pulls, which should actually open the door but it remains closed.
 * "enttry" #37 of Marble Hornets had a brief shot of a kid with a Spongebob SquarePants shirt; the first SpongeBob episode aired in 1999, while MH is set in 1991. The crew quickly removed and edited the video.

Western Animation

 * In the very early episodes of Ka Blam!, June's ponytail is missing in some shots (no wonder why everyone thinks she's a guy!).
 * In Recess, one episode has Gretchen walk to a hole in the playground and mysteriously vanish.
 * Rainbow Brite has the opening where one of the colour kids was rescued...then mysteriously appears in Murky's vehicle with the other colour kids who were supposed to have not been found yet.
 * The otherwise well-written Avengers Earths Mightiest Heroes episode "Who Do You Trust?" has at least two: Janet's wings suddenly appearing, then disappearing between shots, and Tony inexplicably losing his jacket while in Nick Fury's safehouse.
 * The first season finale, "A Day Unlike Any Other," has Loki shatter Captain America's shield, which suddenly becomes fixed again in a group shot, then appears shattered again at the end of the episode.
 * Batman the Animated Series--"Heart of Ice" has at least two shots where Batman's insignia inverts (yellow bat/black oval).