When you're using "cheats" from the main menu, enter any various of curse words or inappriote words, "Spider-Man" will appear to alter one word you enter by punching it.
The game's executable file contains developer comments about frustrations of coding the game and comments about being angry with one of the developers.
On "What if?" mode, the Ark of the Covenant can be found inside a crate at the beginning of the level "Waterfront Warehouse". This could possibly be a reference to Raiders of the Lost Ark, in which the Ark of the Covenant is sealed in a wooden crated and stored in a government warehouse.