Audio problem: Near the beginning of the movie when Charlie crosses the street, a white Volvo brakes hard to avoid hitting him and the driver says "Wake up jerk!" The driver's window was up so there is no way the driver's voice should sound that clear.
Character mistake: When Shep and Charlie need to stop the aliens from tracing the power signal, he impatiently rips the driver's door off Charlie's Festiva because he was taking too long to unlock it. However, Shep gets into the car from the passenger side before Charlie has even retrieved his keys from the detached door. Why would Charlie leave the passenger door unlocked but make a point of locking the driver's door? (00:48:20)