Fringe/Trivia

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 * Acting for Two: All of the characters who have doubles on the other side.
 * Actor Allusion:
 * Peter mentions the remake of Invasion of the Body Snatchers to Olivia. This version starred Leonard Nimoy, who plays William Bell.
 * Walter's research on LSD-induced hallucinations that can grant the subject clairvoyance is similar to the plot of the book (and later film) Altered States. The film version starred Blair Brown, who plays Nina Sharp.
 * Among William Bell's books in the episode "Concentrate and Ask Again" is a copy of a book by Dr. Spock. Another Leonard Nimoy reference.
 * Peter and Olivia meet with a conspiracy theorist who believes himself to be Spock from Star Trek. You should already know who played Spock. More of a Director Allusion, but the story that he tells is somewhat similar to the plot line of Star Trek. However, this was probably intentional as the episode aired in the opening week of the film, and therefore was used to promote it in the process.
 * The episode "Stowaway" involves a woman named Grey who is suicidal after losing her family. The climax of the episode involves a train bombing. Who was she played by? Amanda Greystone.
 * The Season 4 finale featured another character played by Rebecca Mader who near death starting talking like a child. Albeit this time Mader's character's mind reverted to a child's after death, not prior to it.
 * Walter is fixated on the death of his son to the point of insanity. Rather like John Noble's character in The Lord of the Rings.
 * Actor Shared Background: Both Peter and Josh Jackson have mothers who are from Ireland.
 * Fan Nickname:
 * A common fan nickname for alternate universe Walter was "Walternate." Guess what Walter calls him as of episode "Peter."
 * Altivia, Bolivia, Fauxlivia, or, to some especially uncharitable Peter/Olivia shippers, Holivia. It's worth noting that the fans are fiercely divided on which Fan Nickname to use. The series has decided on 'Bolivia'. Walter has decided on Fauxlivia, however.
 * And now there's . Really.
 * Altstrid.
 * Ellanate.
 * Charlnate (or Scarlie) and Lincolnate - though who the latter refers to is a source of debate among the fandom, since Lincoln is a much more prominent character in the alt universe. Some people have taking to referring to the Lincoln on "our" side as 'Kennedy', since Walter called him that once.
 * Fans refer to themselves as Cortexifans.
 * The Polivia shippers call themselves "benchwarmers."
 * Hey, It's That Guy! / Hey, It's That Voice!:
 * Olivia Dunham is Nariko in Heavenly Sword and also Bridget. Charlie Francis is Jackie in The Darkness and Miguel in Oz, Walter is Denethor, and Peter is Pacey and Charlie Conway. William Bell is Spock!
 * A police officer in "What Lies Beneath" is V|Georgie.
 * The Observer (September) is Sweeney Todd. No, not from the movie, but still.
 * Sam Weiss is Uncle Eddie.
 * Alistair Peck in "White Tulip" is RoboCop.
 * David Robert Jones is Lane Pryce.
 * And is going to be Professor James Moriarty.
 * Peter is getting crank called by H.E.L.P.er.
 * In "The Equation", the Keymaker is driven crazy by Britta Perry and housed in an institution run by Death.
 * Broyles is Deputy Director Daniels and Bubbles was a cabbie who got held hostage by Olivia.
 * Martouf is a random CIA Man in Black.
 * Chinese gangster Ming Che in "Snakehead" had been trying to enjoy himself in The Attic.
 * Helen of Troy and Bridget von Hammersmark have cancer. Lots of cancer.
 * The mom from Raising Hope moonlights as a police officer in "Northwest Passage."
 * Walter was married to Siobahn from Mistresses.
 * Hurley apparently works as a Massive Dynamic security guard now. He and Walter share a bong in "Os".
 * Amanda Greystone appears as a woman called Grey who is suicidal after losing her family in the episode Stowaway. The plot of the episode also involves a train bombing. All of this has happened before...
 * Now here's a plot twist fans of The Killing won't see coming - a shapeshifter killed Rosie Larsen in "The Man From The Other Side."
 * Radek Zelenka is a priest on the other side.
 * No wonder Canaan is only killing criminals. He's a Kira. (DELETE!)
 * Windmark is Char Aznable!
 * The alternate comic-book covers briefly seen in Over There Pt. 2 aren't just alterations of the originals; they were apparently redrawn basically from scratch. (DC is publishing the little-known Fringe comic book anyway.)