Anywhere but Their Lips: It's only in their first scene together that Elizabeth says "Not on the lips," to Freddy, and the reason is that she doesn't want her makeup smudged.
Subverted in that she doesn't seem to want to be touched anywhere, lest she mess up her hair, her nails, her dress, etc. In the end she and Frederick say goodbye by shaking elbows. She even flinches when he blows her a kiss.
And right after all that... the train rolls past and she's enveloped in a billowing cloud of black smoke.
Bullying a Dragon: The prison guard when he discovers that the Monster is afraid of fire. Here's a piece of advice: If you're going to taunt a 7-foot tall, super-strong monster with anger issues, don't do so within arm's reach.
Cobweb Jungle: In the passage leading to Dr. Frankenstein's laboratory and the laboratory itself.
Corpsing: Was understandably a problem throughout the shoot. In several scenes you can see Gene Wilder is just barely holding it together.
It's one of the rare films where the crew had issues with corpsing—the "baggage" scene made them laugh so hard that it ruined takes.
Creator Cameo: Brooks is the model for one of the castle's gargoyles, and ad-libbed the That Poor Cat screech when Frederick accidentally throws a dart out the window, as well doing as the howl of the "werewolf".
Creepy Changing Painting: A scowling portrait of Victor Frankenstein is highly visible in Fredrick's room. When Frederick finds his grandfather's instructions and decides to continue his work, a lightning-illuminated close-up shows the portrait looking very pleased.
Creepy Housekeeper: Frau Blücher (*WHINNY!*) is the quintessential creepy housekeeper: as you may notice, every time her name is mentioned, horses rear in fear. Also, in regards to Victor Frankenstein: "He... vas... my... BOYFRIEND!"
"He Vas" Song": Which leads to her singing about Victor in the Musical, complete with Evil Laugh and vamping by Andrea Martin for "He Vas My Boyfriend." Doubles as a Villain Song as she hints he wasn't too nice a guy other than the sex.
Cue the Rain: You know how people tell you to keep going until you hit Rock Bottom? Well, this film demonstrates why.
Dark Reprise: The Musical has "Life, Life" where Frederick is trying to coax Fate to let the Monster he's assembled live, and "Frederick's Soliloquy" has the same tune, but the village is about to hang him, and here he's accepted who he finally is without regrets. The newly-intelligent Monster realizes the hanged Frederick is unconscious, not dead, and is able to revive him.
Deliberately Monochrome: To better parody the original Frankenstein movies. (This was so important to the filmmakers that they took the project to 20th Century Fox after originally conscripted studio Columbia balked at the prospect of it being in black-and-white.)
Don't Explain the Joke: Averted — during the Walk This Way scene, Igor shows Frederick what he means. It doesn't ruin the joke at all, though. Supposedly, this gag was the inspiration for the Aerosmith song of the same name.
In point of fact, it worked so well, it's something of a Running Gag for Mel Brooks. It shows up in most (if not all) of his films. The walk is different, but the joke is always the same.
Failed a Spot Check: Igor managed to miss that the brain he selected to be placed in a seven and a half foot tall gorilla was labeled "Abnormal". If that wasn't enough, the sign also read "Do not use this brain!"
Hypocritical Humor: After what seems to be the failed attempt at resurrecting the dead, Frederick states that it is better to accept both loss and success with "quiet dignity and grace," then promptly loses his shit and takes out his frustration on the monster, choking and hitting the corpse all while screaming incoherently; all of this is lampshaded by Igor who just repeats Frederick's "quiet dignity and grace" line.
As well as Christopher Fitzgerald originally in The Musical. He takes it Up to Eleven when Igor leads the village in "Transylvania Mania" to distract them from the Monster's moaning—and it gets worked into the number, with Frederick and Inga joining in.
In the Blood: "Des-ti-ny! Des-ti-ny! No es-caping that for me!"
Also something of a subversion; Frederick is doing just fine escaping the family tradition (aside from a hamtastic moment in his lecture on neurobiology) until his great-grandfather's will and then his "servant" Frau Blücher (*WHINNY*) railroad him into it.
The Musical also has "Join the Family Business" as a number where the ghosts of Victor Von Frankenstein and other ancestors iron that point home.
Frankenstein: It isn’t. It’s Frederick Fronkensteen.
Igor: I see.
Frankenstein: You must be Igor (pronounces it as Eeee-gor).
Igor: No, it’s pronounced EYE-gor.
Frankenstein: But they told me it was EE-gor.
Igor: Well, they were wrong then, weren’t they?
Just a Stupid Accent: Deliberately, this being a Mel Brooks film. The movie takes place in Transylvania (located in Romania), but the townsfolk generally have bad German or Cockney accents. Kemp's is so terrible that his own countrymen have trouble understanding him.
Lampshade Hanging: After the horses Running Gag is established, Igor stays around, listening intently, and says, "... Blücher." (*WHINNY*) Then grins with satisfaction.
Mythology Gag: The book "How I Did It". In the original Frankenstein novel, we never do hear any details of just how the monster was brought to life. All the stuff with the lightning and stolen brains was added in later adaptations. Some of the lines he reads from the book are taken directly from the novel, however.
Names to Run Away From Really Fast: Just saying "Frau Blücher" (*WHINNY*) causes horses to rear up in fright. Just the name; the woman's actual presence doesn't bother them at all.
Neck Lift: The Monster, to the police officer tormenting him.
Frederick: Now tie off the kites and hurry down as fast as you can.
Igor: What's the hurry?
Frederick: There's a possibility of electrocution! Do you understand?
Igor:[looks down through the skylight]
Frederick: I say: There's a possibility of electrocution! Do you understand?!
Igor:[now stepping in from offscreen next to Frederick] I understand, I understand! Why are you shouting?
[Frederick looks back up at the skylight and does a double take]
Frederick: Did you...Did you tie off the kites?
Igor: Of course.
On One Condition: A deleted scene explains how Frederick inherited the estate of his very distant and disliked great-grandfather: said Baron Frankenstein had left his estate to his much closer relatives, naming each of them specifically, to be divided up evenly, unless Frederick had of his own choosing become a doctor and achieved some esteem in his field. As this had indeed happened, all the money and property went to him. The idea was that the Baron wanted to give his inheritance to someone who would have some chance of erasing the stain on his family name.
Frederick also had to meet the terms before the day Baron Frankenstein would become one hundred years old. Said Baron Frankenstein left instructions that his will was not to be read until then.
At a town meeting one of the townspeople tries to stir up a lynch mob against the newest Baron Frankenstein.
Townsman: He's a Frankenstein! And they're all alike. It's in their blood. They can't 'elp it. All those scientists, they're all alike. They say they're working for us. What they really want is to rule the world!
Later on Inspector Kemp (an authority figure who had earlier argued against violence) changes his mind.
Kemp: A riot is an ugly thing. Und I think that it is just about time that we had one!
Shaggy Search Technique: "Put - the candle - back!" Part of the parody is that Dr. Frankenstein was using legitimate means to search for it before the trope kicked in
Shaming the Mob: The Monster himself does it, with a speech mostly cribbed out of Shelley's original book.
Shoe Shine, Mister?: When Frederick's train pulls in, he asks a shoeshine boy, "Pardon me boy, is this the Transylvania Station?" The boy replies "Ja, ja. Track 29. Oh, can I give you a shine?" This is a Shout-Out to the 1941 song "Chattanooga Choo Choo".
Silly Will: The aged Baron Beaufort von Frankenstein leaves instructions that his estate shall be given to his distant great-grandson rather than shared among a cadre of mooching relatives if said great-grandson has become a respected doctor of his own accord. One of the relatives tries to pass this clause off as insanity but the executor reminded her that civilization is based on law. The scene was removed from the final film.
Smoking Hot Sex: first, Frederick and Inga. Later, Elizabeth and the Monster.
The Musical gave the song "Deep Love" where Elizabeth sings about it, and the Monster also reprises the song in "Finale Ultimo" and proposes to her in his version. She accepts.
Soundtrack Dissonance: The somber musical score is squarely at odds with the screwball tone of the film, yet somehow works perfectly well.
Mel intentionally kept the fact that the film was a comedy secret from the composer, resulting in serious music to a seriously funny movie.
Stand-In Head: Igor pretends to be one of the heads in the lab in order to surprise Inga and Frankenstein.
Stealth Hi/Bye: Igor. It's never explained how he got down so easily from the top of the lab to Frederick's side and why his hump always changes positions
Understatement: In a deleted scene, it was revealed that, to be allowed to inherit his great-grandfather's estate, Frederick Frankenstein had to become a medical doctor of his own free will and earn some measure of esteem in his field. A relative then asked if Frederick did acquire a "measure of esteem" and was told he's the fifth most respected expert in his field.
The Unintelligible: Inspector Kemp borders on this, even with his fellow countrymen. (See Title Drop above.)
The Monster also qualifies before Frederick gives him some of his intelligence. The Musical uses this for effect for two numbers:
"Transylvania Mania" has Igor, Frederick and Inga trying to cover up The Monster's musical moaning with the song and later, the village joins in as well as a trombone.
"Puttin' On The Ritz" has The Monster do a scat-singing solo, showing he knows the tune even if he can't say the words.
Unusual Euphemism: "Schwanzstucker", which is semi-accurate Yiddish; "schwanz" is indeed a word used to refer to the male member.
Video Will: Frederick Frankenstein's great-grandfather left a recorded message in an actual record.
Complete with Broken Record, where, after the news of their not getting any inheritance has been relayed, the will gets stuck on the unfortunate phrase - "Up yours... Up yours... Up yours..."
Vile Villain, Saccharine Show: While most of the movie's antagonists are played as silly, one policeman who tormented The Monster with his fear of fire is notably played very seriously. (It's implied that he does it For the Evulz.) This is jarring compared to the light-heartedness of the rest of the film.
A very subtle gag - if you count them, the clock actually strikes thirteen!
Whole Plot Reference: The film is specifically a parody of Son of Frankenstein more than any other movie. The inspector with the wooden arm and the part where he talks with Frankenstein while playing darts are a direct lift.
Inspector Kemp: Then I may give the villagers your complete assurance that you have no interest whatsoever in continuing your grandfather's work? Monster: (in background) MMMMMMM! Inspector Kemp: May I take that for a yes? Frederick: ...Mmm.