Factual error: When Dick robs the store, a sign on the cash register reads "You must be born after this date in 1983 to buy beer." Since the legal drinking age is 21, that would mean the movie is set in 2004. However, the film states that the year is 2000.
Continuity mistake: When Jack McCallister climbs into the helicopter and closes the door, his jacket was unzipped. A split second later in the next shot when he salutes Dick and the helicopter takes off, his jacket is zipped up, his seat harness is fastened, and he is wearing hearing protection. One might argue that he zipped up and buckled up between shots that we didn't see, but there was no break in the audio track between the two shots. (00:16:30)
Visible crew/equipment: The first day Dick is home after losing his job, he opens the fridge and the light reflects in his eyes. There are three white reflections in his eyes instead of just one in the center.
Factual error: When we see Jane spotting her friends you can see a Nissan Xterra. But the one shown is a 2003-2004 model, but this movie takes place in 2000.
Continuity mistake: After the Harpers get their power cut and they're hiding in the dirt hole in the backyard, one of their lights are on in the background despite the fact the power was cut.
Continuity mistake: In the scene where Dick, Jane, and Billy are eating dinner on the floor near the fireplace surrounded by candles, you can see Billy jumped up and nearly take a step on a candle, tipping it over. Jane is pointing her arm at the fact the candle is tipped over near the foot of Billy but in the next shot her arm is relaxed as the power comes on.JamesBondman