Factual error: Early in the movie, you see Largeman arrive at work and the hose from the gas station is still hanging out of the gas tank. The hose wouldn't have been frayed like it was shown. All pumps, at least in the U.S., have a breakaway point that allows the hose to break cleanly and reseal.
Factual error: The town that they live in can't exist geographically, despite being set in reality. Tim works as a knight for Medieval Times which is off rt 17 near Rutherford. They also mention that Sam's "brother", Tetembe, attends Rutgers which has a New Brunswick, Camden and Newark campus. The closest campus to Rutherford is Newark which is still about 40 minutes away, so in order for the characters to be in a suburban location within 15 or so minutes of both Medieval Times and Rutgers is geographically impossible.