Watch the scene where Eddie (Meatloaf) is singing Opportunity, Bless my Soul. While he is riding around on the motorcycle you can see his arms moving back and forth. I was told that this is because he was actually in a wheelchair, and was pushing it around the lab. I was also told that this is because he is deathly afraid of motorcycles in real life. I don't know how true that part is but you can see his arms moving.