When Jamie is showing the kids how to play the House of the Dead arcade game, she picks up the light gun and starts playing. When they show a clip of the gameplay, both red and blue gunfire is shown; indicating that there are two people playing.
When the kids are playing house of the dead they never reload even though it says to reload on the screen.
Jamie's Grandmother is hit by a train but doesn't even bleed.
Jamie states earlier that her grandmother does not have a phone, yet she sends an email from her grandmothers apartment.She would have had to have dial up service for the email to go through in 2001.