In the parking deck scene, Billy Martin walks up to Steve and says "Why would you be sleeping in your car". This is all wrong. Steve has a motorcycle. This is due to a recast of Steve late in the film, forcing a reshoot of his scenes. John Henry Scoot, playing Billy Martin, was unavailable to reshoot. So the old footage was used with new footage. And no one ever notices...
Most of the film is done with audio from the camera mic. It was usually easier and faster to use that instead of a boom mic due to budget reasons.