 CHAR: SPOILER: At the radio station, when Dave threads up the tape  recorder to play back his previously recorded demo tape so he can  leave the studio to save Tobie from her "roommate", he mistakenly  twists the tape in the machine. This would have the effect of  playing the back side of the tape. At best, a very muffled playback  of the tape would occur if the tape were threaded in this manner. At  worst, nothing at all would be heard.