The windows' shutters slam shut although exterior and model shots show all of the windows are boarded up.
Several times a character pulls a gun and the usual gun cocking sound is heard. The problem with this is that the guns making the sound were usually hammerless, so they cannot make that sound. This is a common TV cop error made by people that do not understand how guns operate.
Audrey, Duke, Tommy and Claire are in the haunted house and decide to split up into teams. Audrey suggests Claire come with her and Duke go with Tommy, but Duke would rather Audrey come with him and Claire go with Tommy. Audrey says no, because "each team needs a cop with a gun." meaning her and Tommy. But if she went with Duke and Claire went with Tommy like Duke suggested, each team would still have a cop with a gun.