* ActingForTwo: TheMusical originally had Fred Applegate play both Inspector Kemp and Harold, the blind Hermit.
* AFIS100YearsSeries:
** AFIS100Years100Laughs: #13
** AFIS100Years100Songs:
** #89, "Puttin' On The Ritz"
* BillingDisplacement: Teri Garr, who portrays Inga, is billed below Madeline Kahn (Elizabeth) and Cloris Leachman (Frau Blücher), despite being the female lead and having more screentime.
* TheCastShowOff: Creator/MelBrooks, who knew that Madeline Kahn had a lovely singing voice, felt so guilty about making her [[HollywoodToneDeaf sing badly on purpose]] in ''Film/BlazingSaddles'' that he gave her a short scene where her character sings "Battle Hymn Of The Republic" to make up for it.
* CreatorCameo: The howling wolf sound on the ride to the castle was made by Creator/MelBrooks. He also voices the cat Frankenstein hits with a dart and the original Dr. Frankenstein.
* CreativeDifferences: By all accounts it was a smooth shoot, so much so that new scenes were added and filmed just because the actors were having so much fun. However, Mel Brooks and Gene Wilder frequently butted heads, especially over the now-famous "Puttin' On The Ritz" scene which Wilder had to fight for until he was blue in the face just to prove how badly he wanted it keep it. One particularly brutal day ended with the two parting ways after a huge fight, only for Mel to call him that night and apologize in his own special way by asking "Who was that asshole you were fighting with today? If you ask me, he should be fired!"
* DeletedRole: Leon Askin played a lawyer (reading the last will) but was cut out.
* FakeNationality: In ascending order: Inga, Frau Blücher ([[RunningGag *WHINNY*!]]) and Inspector Kemp.
* PlayingAgainstType: Creator/GeneHackman appears in a rare comedic role.
* RecycledSet: A lot of the laboratory equipment were Kenneth Strickfadens original props from the ''Film/{{Frankenstein 1931}}''.
* ThrowItIn
** Igor's hump, which changes position from scene to scene; Creator/MartyFeldman decided to do this on his own, without telling anybody beforehand. When someone finally noticed, they added a bit where Frederick does as well.
*** This has appeared again in other Creator/MelBrooks films - Prince John does it with his facial mole in ''Film/RobinHoodMenInTights''.
** During a search in the forest, Inspector Kemp's wooden arm appears to have switched sides. On closer inspection, it's actually the entire scene that's obviously been flipped as his eyepatch and monocle are on the other eye, and his badge is on the other side.
** Creator/MelBrooks ad-libbed the sound of a cat getting hit with one of Frederick's darts.
** Almost a Throw It ''Out'' moment; in some interviews, Brooks stated that the only point during production where he and co-writer Creator/GeneWilder seriously disagreed was the inclusion of the "Puttin' On the Ritz" number. Gene loved the idea but Mel hated it. After Gene vehemently defended the scene, Mel decided, "If you feel that strongly about it, we'll shoot the scene. If it works, we'll use it, if not, we won't." They shot it and it became one of the highlights of the movie.
*** The monster's shout of "PUTTINAHNDARIZZZ!" was Creator/PeterBoyle's idea.
*** Wilder wrote in his autobiography that he kept trying to find ways to add additional scenes to the shooting schedule because the cast had a thoroughly great time together and Wilder didn't want filming to end.
** "Soitenly! You take the blond, I'll take the one in the toiban!" Marty Feldman's Creator/GrouchoMarx-esque riff was one of many moments that Mel Brooks was not expecting, to his delight.
** The blind man's parting line "I was going to make espresso!" was improvised by Creator/GeneHackman. The scene ''immediately'' fades to black to cover up the laughter of the film crew.
* {{Tuckerisation}}:
** The Gasthaus, or guest house at the beginning of the riot scene is Gasthaus Gruskoff, named after producer Michael Gruskoff.
** The name on the third brain when Igor makes his selection is that of the movie's assistant property master, Charles Sertin.
* WhatCouldHaveBeen: Originally in the script, after Igor drops the brain jar, he was to turn to the camera and quip, "Funny thing is, I tried!"
* WrittenByCastmember: Creator/GeneWilder co-wrote the script with Creator/MelBrooks.

* The Music/{{Aerosmith}} song 'Walk This Way' is named after Igor's cane gag.

!! This film [[ImageSource provides the page image]] for:
* CreatorKiller
* CreepyHousekeeper (WHINNY!)
* FictionalDocument
* FishEyes
* RollInTheHay
* TheVonTropeFamily