Trivia: If Mary Swanson married Lloyd instead of her fiance she would become Mary Christmas.
Trivia: When Jim Carry said "hey want to hear the most annoying sound in the world?" and makes the weird sound. That scene was not in the script (watch Jeff Daniels).
Trivia: In the bar scene Lloyd sees the newspaper clipping on the wall and says "No way! We landed on the moon?" This wasn't in the script - Jim Carrey improvised the line and it was left in the movie.
Trivia: Jim Carrey really has a chip in his tooth. For the filming of Dumb and Dumber he had the bonding on his tooth removed.
Trivia: Seabass actually makes an appearance in Me Myself And Irene as one of the Maine State Troopers at the end of the movie. In both cases, Seabass is played by ex-Boston Bruin, Cam Neely. He's a good friend of the Farrelly Brothers, and Jim Carrey.
Trivia: When Lloyd pulls the scam on the truckers, he said that he saw it in a movie - the movie he is referring to is 'Something Wild' where Jeff Daniels (who plays Harry) pulls the same scam.
Trivia: When Harry and Lloyd eat the hot peppers, the actors were supposed to eat a red candy, but Jim Carrey accidentally ate one of the peppers.
Trivia: In the original ending, Harry and Lloyd would have climbed onto the bus full of bikini models. Jim Carrey fought hard not to have this ending, so it was changed to them not getting on the bus and walking back home.
Trivia: Jeff Daniels plays Harry, and Jim Carrey plays Lloyd - a reference to the comedy actor Harold Lloyd.
Trivia: The opening credits are chock full of intentional misspellings. (Examples: "Costoom Designer Mary Zophres", "Muzik Supervisor Dawn Soler", etc.)
Trivia: Karen Duffy plays J.P. Shay in the film. In the film "Blank Check", which was released only 10 months prior to this film, she played "Shay Stanley."
Trivia: The Overlook hotel is the very same one seen in The Shining film.
