Factual error: When Sid gives his credit card to Jay to pay for their meal because Jay's mom doesn't have enough money, a magnetic strip is on the back of the card. This technology wasn't used on credit cards until 1980. The film takes place in the 70's.
Factual error: During the bank car heist at the start of the movie, the guard who leaves the drivers seat and fires with a rifle fires way more shots than is feasible without reloading at any point.