There's some humor to be found in the fact that, unlike most other games, you can outright break Death's Scythe with your whip. He doesn't even think to get a new one until the second phase of his rematch, and when he does, he accidentally decapitates himself with it.
The use of keys as weapons / Item Crashes, followed by a question mark from your character. Doubles as a Moment of Awesome if you manage to defeat Dracula only using it as described above.
An area that involves traversing a staircase of Fleamen riding metal balls ends with the exit to the tower on one side, and the source of the Fleamen on the other. Making your way up there with just the right jump will allow you to see a burly ogre man whose sole purpose is to load the orbs (with Fleamen pre-applied) onto the path after they've hit the end of the path down below. Apparently Dracula is a firm believer in recycling.
Just the idea of Dracula being beaten to death by a young girl throwing birds as weapons. Not to mention that beating the remake as Maria will have Dracula completely flabbergasted that he lost to a "little girl".
If you tried to play the original version of the game with the wrong system card, it wouldn't just display a boring error message like most games, but rather load up an entire joke minigame called Akumajyo Dracula Peke. It must be seen to be believed.
The one-ups in Maria Mode are dolls resembling a Super-Deformed version of Richter. There is no explanation for this in the game proper, but one set of fan-comics provided a speculative reason. Namely, that Dracula was (presumably) the Richter Dolls' creator. When Richter confronts him about the subject, Dracula snatches the doll he brought from him and tucks it into his shirt... only for it to fall back out during his dialogue prior to their boss fight.
