When I was a kid, someone gave me a hardbound collection called “Batman from the 30’s to the 70’s”, which I read religiously, and still retain much information from.
Max Shreck was the name of the real-life actor who played Count Orlock in silent film “Nosferatu”. I always assumed that was a scriptwriting fan’s reference to that film.
As for the Robert Wuhl character, I think they stuck him in the film to add a little Perry White/J. Jonah Jameson-style media antagonism into the mix, but I could be wrong.
The comics I read back then didn’t spend a lot of time focusing on women who were Batman’s or Robin’s (or Bruce Wayne’s or Dick Grayson’s) love interests, except for the daughter of the nefarious Rahs Al Ghul, whom batman was obsessed with. I can’t remember her name.
Sugar & Spice I think were invented because the filmmakers wanted to emphasize a dichotomy in “Harvey” Two-Face’s good and bad sides. Two-Face was actually my favorite villain in the comics I had (The TV series had ruined Joker, Riddler and Penguin for me), and I was very disappointed in the film’s treatment of him. In the early comics, they mainly emphasized his obsession with the number two (I recall one panel where his desk had two phones, two pen sets and two lamps, all pairs being duplicated on an identical desk right next to it.) The good/bad dichotomy was relegated to a two-headed coin with one scarred side (just like his face) that he flipped when he needed to make a decision.
I don’t recall a Boss Carl Grissom (been a long time since I saw the film, was he the Joker’s former boss?), but there was a Boss Zucco in the comics who had Dick Grayson’s aerialist parents killed as a threat to a circus owner, spawning him to become Robin.
Before an accident in the chemical vats of a playing card company that altered his appearance (without the film-added touch of plastic surgery, thank you very much), the Joker was a smaller-time crook called the Red Hood, who worked for himself. I was very glad to see the retention of Joker’s grin-inducing poison in the movie, by the way.
Joker didn’t kill Bruce Wayne’s parents, either, it was a crook named Joe Chill.
OK, I’ve just scared myself really badly by remembering all this after 25 years of more or less not giving a shit about comics, so I’m going to curl up in bed and suck my thumb now… 