** The voice of Ace Ventura and the manner in which he speaks, was added by Creator/JimCarrey only after several read throughs of the script. The voice was something Carrey used in his stand up routine. The "All righty then" was the catch phrase of one of his stand up characters and after the lines from the script weren't feeling right, he added it to the script and read through it again using that voice for all the lines. It was such an improvement that it became the main Ace Ventura personality trait.
** Carrey came up with "Alrighty then" and other lines specifically because he thought they might catch on. The hand gesture Ventura gave before leaving the police station was also something Carrey intended to become popular. It did not.
** Despite being his StarMakingRole, Creator/JimCarrey does not like Ace Ventura. Carrey was displeased with the sequel, causing him to swear off ever doing a sequel for any of his characters (although he has since done the ''Film/DumbAndDumber'' sequel ''Dumb and Dumber To''). This had an arguably lasting impact on his career as well since this role is seen as the reason why [[AwardSnub he's yet to get nominated for an Oscar.]] Of course, Jim Carrey famously dislikes watching his own performances in anything.
** Carrey allegedly dislikes the sequel, while many fans consider it to be funnier than the original. Of course, funnier doesn't always mean better; it certainly cashed in on dirty humour. According to Jeff Daniels, Carrey had explained to him the reasons why he didn't like the sequel much. He disliked the whole "Ace is afraid of bats" angle, as he found it to be a cheap AssPull, and even fought with the director about changing the script so that Ace was merely ''allergic'' to bats. Carrey was also very nervous about the film's depiction of the native characters, and that people might take offense to them. He's even surprised the film hasn't been outright banned! He wouldn't make another sequel to one of his films until ''Film/DumbAndDumberTo'', which unfortunately was ''far'' less well-received.
** Creator/JenniferAniston told a story a few years ago about visiting Creator/CourteneyCox and bringing a copy of ''Ace Ventura'' to watch. Courteney refused to watch the film, suggesting she either doesn't like to watch her own work, like Jim Carrey, or that she just doesn't like the film much.
* FakeAmerican: Newmarket-born Jim Carrey plays the Floridian Ace Ventura.
* TheOtherDarrin: Anne Cusack replaces Creator/CourteneyCox as Melissa in ''Ace Ventura Jr''. She's apparently out of the sports business, now working with animals, married Ace and they have a son.
** The ''Manga/OnePiece'' character Franky (a.k.a. Cutty Flam) was based on Ace, at the admission of ''One Piece'' creator Eiichiro Oda.
** ''Series/SisterSister'' had Tamara frequently use Ace's "Aaaaaaaaallll-righty then" CatchPhrase.
* StarMakingRole: For Creator/JimCarrey.
* ThrowItIn: The short scene during the party where Ace pulls the cellist's arm as he walks by, making him produce a false tone, was improvised by Creator/JimCarrey.
** Melissa Robinson was named after original writer Jack Bernstein's daughter Melissa.
** Ace Ventura's landlord is named Mr. Shickadance. When Creator/JimCarrey was growing up in Toronto, he lived in an apartment building that was managed by Schikedanz Brothers.
** Sgt. Aguado was named after producer Ken Aguado.
** "Shady Acres Mental Hospital" is named for director Tom Shadyac.
** There was supposed to be a scene after Ace crashed his car while chasing Dan Marino's kidnappers. The white pigeon landed on his car, he got it singing "I got the white pi-geon! I got the white pi-geon". Then, in a parody of ''Film/TheBirds'', he is surrounded by birds that started tearing him apart. Then he [[AllJustADream wakes up]] with a big "whew." It was removed from the finished film since it was too dark, but ironically in the commentary WordOfGod says it was funny on paper.
** The giant hook Ace used to knock out two of Einhorn's henchmen was supposed to [[OffWithHisHead knock their heads off]].
** The original concept is the Pet Detective character was a bumbling idiot, until Jim Carrey was cast and his character was rewritten.
** Creator/RickMoranis, Creator/JuddNelson, and Creator/AlanRickman were all considered for the role of Ace.
** Lauren Holly, Creator/CarrieAnneMoss, Creator/TeaLeoni were all considered for the role of Melissa.
** Originally Ace wasn't written to be animal-related, but more of a generic Literature/SherlockHolmes parody. Screenwriter Jack Bernstein came up with the pet detective idea after watching a Creator/DavidLetterman sketch about pet owners.
** At one point, the producers considered making Ace female, being named "Alice" instead, and with Creator/WhoopiGoldberg as their preferred choice.