Never Trust a Trailer/Web Animation


 * An egregious example is the trailer for the third Arfenhouse movie. The actual movie turned out to be a few seconds long (not counting credits) and was a Take That to all the creator's fans who were nagging him to deliver on his promise of a sequel, though real sequels were eventually made.
 * Parodied by Legendary Frog in the One Ring to Rule Them All: Special Edition, in which a "One Ring 3" Teaser includes shout outs to the movie Speed, the Incredible Hulk, and Charlie's Angels. Lampshaded by Sauron, who asks "Will any of this be in the actual movie?" His goblin assistant, Wayne, tells him that it'll all be cut in post-production.
 * The season 7 trailer for Red vs. Blue showed both Church and Tex watching over the Red and Blue teams in Valhalla. Neither actually appears in that season. In fact, according to Word of God,
 * The difference here is that Red Vs. Blue trailers are more like prelude episodes than actual previews. The season 7 trailer contained no footage from later episodes because it wasn't supposed to. Church and Tex seem to have been inserted into it to encourage Wild Mass Guessing as to what unseen role they may have had in the season.