* ActorAllusion: After scamming Seabass to pay for their bill, Lloyd says he saw it on a movie. The movie he is speaking of is ''Film/SomethingWild'' and Creator/JeffDaniels does the same thing to Creator/RayLiotta.
* BreakthroughHit: For The Farrelly Brothers.
* DyeingForYourArt: Lloyd's chipped tooth is real - Creator/JimCarrey had chipped his years previously, and had it uncapped for this film.
** Creator/JeffDaniels 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 Creator/JeffDaniels, who played two characters named Harry in 1994, the other being in ''Film/{{Speed}}.''
* PlayingAgainstType: Creator/JeffDaniels 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 ''Film/SomethingWild".
* RomanceOnTheSet: Creator/JimCarrey 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: Creator/JimCarrey 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 Creator/JeffDaniels 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!"
* WhatCouldHaveBeen:
** Creator/NicolasCage and Creator/GaryOldman were the original choices to play Harry and Lloyd.
** Creator/SteveMartin and Martin Short both turned down the role of Lloyd.
** Creator/RobLowe and Chris Elliott both turned down the role of Harry.
** [[spoiler:An entire subplot was filmed involving Mary's kidnapped husband Bobby being kept in a wooden shipping crate, but was ultimately discarded. The brief scene where Nicholas and Shay discuss the snow owl incident had originally led into a scene where Bobby manages to escape while still inside the crate]].
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