Deliberate mistake: This is being made as more of a movie than a documentary as it is using actors to portray Jesse Ventura and other wrestlers (like The Superstar Billy Graham). Needless to say because TBS is making the film, WCW Monday Nitro and Thunder were used to film the matches. As a result the rings contain logos for those events (neither the events nor the logos existed in Ventura's days as a wrestler). In addition the ring announcer is using a cordless microphone which was definitely not in use when Ventura fought the Superstar.
Deliberate mistake: The song "If you give me your attention" (from "Princess Ida") and the Mikado's song (from "The Mikado," of course) are performed with their central verses omitted. This was no doubt to save time and, in the case of the Mikado's song, to avoid inclusion of the line "is blacked like a ni**er" (altered in 1948 to "is painted with vigour").