Continuity: Right after Ellie was kidnapped, Dr. Challis runs to a pay phone and dials the Operator to get help, and begins to state, "Operator." and gets a recording. Not only does he get a recording (which would be impossible in the real world), but the recording itself states, "Your call cannot be completed as dialed. Please check the number and dial again, or, call your local operator." Problem is - he was dialing the operator.

Audio problem: During the scene where Dr. Challis goes to visit his two kids, they put on their Halloween masks and his little son says "Let's watch TV." He goes to turn the knob to turn on the TV and a split second BEFORE he turns it, we can hear the intro of the commercial on the television.

Continuity: During the scene where Dr. Challis is at the bar and Ellie walks in to find him, look carefully as Ellie approaches Challis. In the long shot Challis takes a drag from his cigarette and is exhaling the smoke just as Ellie walks up, but a split second later, Challis is not blowing any smoke out. In fact, there isn't even any smoke around where he would have exhaled.