After defeating Fulton Balcus, Sean removes the armor and has no clothes on. As Sean and Mizky leave, Sean is wearing sneakers. Mizky only brought him a shirt to wear.
Mark Hamill is depicted on the poster and cover art in such a way to suggest he's the "Guyver." In actuality, he merely plays a supporting character, while soap-opera actor Jack Armstrong plays Sean Baker/The Guyver. It has been suggested that this rather deceptive artwork was put together to lure in Hamill's fans from films like "Star Wars" by making him appear to be the lead character.