Note that as Hudson and Wolf fight, Wolf's face is suddenly portrayed as far more similar to a typical werewolf when it previously was far more similar to his human. Afterward, he is back to his more human-like appearance.
During the battle at the trainyard, Wolf tears a steel girder off its support. As he swings it forward, he knocks a track switch over from behind. However, rather than bending over in front of Wolf, it snaps behind Wolf instead, which, from the "camera" angle, is a physical impossibility.
In Act 1 when Dingo is talking to Wolf about taking out Goliath his mustache is missing.
Lexington: If I was leader, I'd make sure that my clan knew where I was at all times.
Broadway: If you were leader, I'd be somewhere else at all times.
Lexington: Not a bad night. Two muggings broken up.
Brooklyn: One mugging, and one burglar who's considering new career options.
Broadway: Three muggings and an armed robbery. Just have to know where to look.
Dingo: You're not our leader, Wolf. You're barely our species!
Morgan: What I wanna know is where do we take them? A hospital? A machine shop? Or a vet!?
Fox: You're not mad? I know you don't like to lose.
Xanatos: But I've won, my dear. For in you, I've found my true equal.
Television: The following is a paid commercial message.
Lexington: Wait a minute, that voice! It's Fox!
Fox (voice on television): Tired of that long walk down Lexington? Bored with the bus ride down Broadway? Sick of bumper-to-bumper all the way to Brooklyn?
Brooklyn: She's talking to us...
Fox: Don't PACK it in, take the train.
Brooklyn: She wants us there... where the tracks cross.
Brooklyn: They were powerful enough to take out Goliath...
Lexington: You may be afraid to fight without Goliath, I'm not.
Broadway: Me neither!
Brooklyn: Guys, we won't get two chances at this... I have a plan.
Coyote: I like being stronger than any of you.
Brooklyn: But not stronger then all of us!
Hyena: I know you're around here somewhere, you flying rat.
Lexington: That's Mr. Flying Rat to you!
Dingo: What a choice – a robot who thinks he's human, or a human who's gone to the dogs.
Coyote: Sorry, Wolf, but I think my Goliath tops your Hudson.
Dingo: I knew it was a bad idea to stick with this crew, not after they went Frankenstein on me.
Frankenstein is a novel in which the title character created a monster from the parts of several people and brought him to life.