* DyeingForYourArt: Lloyd's chipped tooth is real - Jim Carrey had chipped his years previously, and had it uncapped for this film.
** Jeff Daniels also got his hair naturally frizzy that way by not conditioning, blow drying, or combing his hair for two months.
* MissingTrailerScene: Two of them:
** ''(when being pursued by the cops)'' "I have an idea. Go..... FASTER!!!"
** An alternate take of the "It's okay! I'm a limo driver!" scene, with Lloyd still moving as he says it.
* OneSteveLimit: Averted out-of-universe; actress Karen Duffy oddly played two characters named Shay that year, in this film and ''Film/BlankCheck''.
** Averted also with Jeff Daniels, who played two characters named Harry in 1994, the other being in ''Film/{{Speed}}.''
* PlayingAgainstType: Jeff Daniels was not a comedic actor before he made this film, but the Farrelly Brothers convinced the studio to let them have Daniels in their movie when they watched ''Something Wild".
* RomanceOnTheSet: Jim Carrey and Lauren Holly married after meeting on this film, but it lasted less than a year.
* SequelGap: ''Dumb and Dumber To'' comes out 20 years later. The setting apparently has Lloyd spending all this time faking insanity to the point of catatonia just to prank Harry.
* StarDerailingRole: Averted, thankfully. Jeff Daniels was warned by his numerous people that if he took the part, his career was over. Never happened.
* ThrowItIn: Jim Carrey threw in quite a bit, like "We landed on the moon!" and even "the most annoying sound in the world" (with the latter, you can clearly see Jeff Daniels and Mike Starr trying to hold it together, bracing for whatever Carrey was about to do; [[{{Corpsing}} Daniels fails and loses his shit]] right before it cuts to a close-up of Starr).
** Also, "Big Gulps, huh? Well, see ya later!"
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