Revealing mistake: In the first shot with Magnum on his surf ski, Tom Selleck is replaced by a body double whose face can be seen distinctly behind the large wave. (00:02:40)
Revealing mistake: When TC and the kids are watching the game live at the stadium, the film is much grainier making excessively obvious the usage of stock footage. (00:17:00)
Revealing mistake: When Magnum screams to attract Rick's attention and you can see the whole yacht, you can spot the real driver of the boat on the flybridge, not lit. (00:41:00)