While Herman falls to the ground after getting hit by a car (and while he picks himself up off his feet) you can see his wig (hair) separating from the top of his head.
Lily says that it took 151 years for Herman to reach his 2nd childhood, implying that Herman is 151 years old. This would make Herman's "birthday" 1815, going by the date of this episode's first airing. This is very accurate to the actual date of the creation of the novel Frankenstein. It was in 1815 that Mary Shelley first conceived of the idea, writing begun in 1816, finished in 1817, and published in 1818.
Area code "416" for Happy Valley would put the lodge in or near Toronto, Canada.
In the scene in the dungeon with Johann, Herman and Grandpa, a man wearing a mask was used instead of having two Fred Gwynnes.
Herman tells Grandpa that he's going to see Dr. Frankenstein in order to give him a progress report on Johann. When Herman returns from the visit, however, he enters his house with a newspaper and lunchbox, as though he has just returned from a day at work.
Eddie wins two stand-up cutouts of Zombo. One is autographed "To Eddie"; the other is signed "To Eddy."
The man on the train is reading from Edgar Allan Poe's The Fall of the House of Usher when Lily peeks her head in.
This is the first appearance of Clyde.
Clyde's boxing glove device punches Herman in his right eye. But later, he has a black eye on his left side.
Towards the beginning of the show, we see the porch light fall right on top of Herman Munster. However, we can clearly see it's a stunt double, not Fred Gwynne, who's hit.
Although the radio station that plays Herman's record is never really identified, the disc jockey's name is Dick Willet and he works out of studio 5. "Dry Bones" debuts on the 6 o'clock show and the station's phone number is Zenith9460.
When Lily and Grandpa go to the police station to claim "John Doe" (Herman), the officer brings in Herman and the sergeant introduces him to Mrs. Lily Munster and her father. There is no discussion prior to this where Lily and Grandpa tell the desk sergeant who they are.
Unlike most amnesia episodes of the time, Herman is not restored to his old state by a bump on the head.
We learn in this episode that Herman and Lily were married in 1865. Herman would have been about 50. We get to see their wedding picture, which includes, of course, Herman and Lily, Grandpa and two unidentified people presumably from Herman's side of the family.
Vic Mizzy provided the music for the movie. He provided the music for the original series of The Addams Family
This is the first of two appearances of Mr. Gateman, although he was frequently mentioned.
This is the only episode with the Drag-ula, although it was in the end credits for the second season. Herman said he needed the box back at the parlor. Grandpa rebuilds it from different parts when the Munsters visit England in the film Munster, Go Home!
Herman thinks Grandpa is a beautiful "woman", even though it's established that they think Marilyn and other good-looking people are ugly.
Uncle Gilbert is the Creature from the Black Lagoon.
Herman's outfit during his stuck-up stage included sunglasses, a beret, an oversized cigarette, and an overcoat with his name on the back: "Herman Munster Movie Star."