Fridge Brilliance: Go watch Son of Frankenstein, the movie that Young Frankenstein draws most of its material from. In that movie, the titular son of Frankenstein has a son of his own; a young boy who bears more than a passing resemblance to Gene Wilder, who plays the grandson of Victor Frankenstein. Coincidence, or perfect casting?
If you were to read a script of the Monster's last scene with Elizabeth, all of his dialogue could be very accurately transcribed as "Grunt", and he still manages to come across as intelligent and sophisticated.
Another Genius Bonus: In every other version of the story, Frankenstein is repulsed by his creation and rejects it, causing said creation to act out and cause mayhem, becoming a poster child for Creating Life Is Bad along with a Deconstruction of what creating a new life entailed. But in the Affectionate Parody, that trope gets turned on its ear. Frankenstein comes to a Heel Realization and realizes that this "monster" is his child, and a child he has to care for. Because he does what no other version was willing to do and take responsibility, which Reconstructs the whole idea, the film has a happy ending where both Frankenstein and his creation come out benefiting one another.