Factual error: While handling the ignition coil cable to the distributor cap, Joe Pesci tells De Niro that the timing chain needs adjustment in his truck. A truck of that year with an inline Chevy motor would not have a timing chain at all, instead this truck would be equipped with a direct drive timing gear. Even if it had a timing chain, it would be behind the water pump and a cover. It would have been a several hour job to replace, not possible to adjust it.
Factual error: During the battle at the Marshalls-Gilberts, the movie shows mountainous terrain. The real Marshalls and Gilberts are atolls with very little terrain.
Factual error: The film states that the story takes place in the year 1998. Everything in the opening scenes crams in every 90's cliché imaginable to reinforce the era. However, at 1m56s into the movie, the main character is driving on the freeway and it cuts to a shot showing that he's driving behind a marked police car. Specifically, a Police Interceptor model Ford Explorer that did not hit the market until 2012. (00:01:56)
Other mistake: Judy is singing on stage with some showgirls. She is singing into a wired microphone. At the end of the song she twirls around twice, but the microphone does not appear to get wrapped around her. (00:49:35)