Like from the first movie, I would enjoy seeing a couple of little comic-throw-ins for the fans. Sort of along the lines of Roger being in the background and whatnot. This could mean randomly throwing out the names of another agent (Kate or Ben), or maybe have them in a cross-by scene. Just to give us a chuckle and make us feel clever.
Along those lines, I'd like them to mention why Agent Myers left. He was okay for an original character (Agent Clay was better), so I don't mind his absence. But, to just get rid of him without an explanation in the movie seems a bit unusual.
I would never turn down the Monkey with the Gun. Classic.
But I think one of the best scenes would be the Pancakes storyline. It's fun, just there for a little laugh. If not Hellboy 2, it should definately be in a possible Hellboy 3 - especially if the later is going to be all hell-on-earth.
Rasputin, Ilsa, and Kroenen did not have too much characterization that made it on film. They didn't need it, we all knew they were just a group of maniacs trying to bring forth the Seven Headed Beast to destroy the world. But, Prince Nuada seems like he's going to have a much more interesting reason for his psychoticness. I want some great seens in his and Princess Nuala's elvish world. Not to say that a giant army of goblin-built robots isn't going to be bad-ass enough, but you can never have enough.
And Abe needs to shoot something.
