Factual error: Ron Pearlman plays a state police captain named "Captain Soames". On his uniform he has both captain's bars on his shirt collar and sergeant's stripes on his upper shirt sleeves. He would not hold both ranks and would not keep the sergeant's stripes on if he had been promoted to captain. He also would have gone through the rank of lieutenant (one bar) prior to becoming a captain, so he would have had plenty of time to take the stripes off his uniform.
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Sleepwalkers mistakes
Continuity: In the last scene, Tanya gets her arm cut on a piece of glass in the window by Charles, just before he turns to fight a cop. In the next shot the glass has disappeared from the window completely.