Continuity mistake: When Bruce is being towed by the ambulance although the sheet starts ripping in the middle, the knot gives out and it becomes totally detached from the ambulance. Some subsequent shots show the ambulance with part of the sheet trailing in and some shots show it with no sheet. (00:31:36)
Factual error: The film takes place in 1981 (the film very specifically states that it takes place "EXACTLY 500 years" after the prologue set in 1481), meaning that the several references to the Nintendo Entertainment System don't make sense, since they weren't released until a few years later, in the mid-80's. ('83 in Japan under the name "Famicom" and 1985 in North America to be exact).