According to several pre-release screenshots, there was originally a section where the players got to ride the motorcycles they are so often attacked by. This section was obviously removed for the final version.
When the UK magazine Mean Machines Sega reviewed the game in 1994, they had their art editor draw a cover picture with Zan and Blaze standing in front of the Manhattan nighttime skyline. Sega Europe bought the rights to the artwork to use it for the cover of the UK/Europe release.
If you ever wonder why the marsupial Roo (Victy in Japan) appears in the game's box cover, this is because there are two cheat codes to access and play him.