In the episode "Scuba Doobie Doo," a Jerry Walden is accused of killing a Bruce Skeller and then dressing him in SCUBA equipment to disguise the cause of death. Watch the scene in which Catherine and Nick are interrogating Walden for the final time. (This is just before Catherine says, "Gotta love this job.) Watch Catherine's part carefully. Her trademark sidepart moves from left to right numerous times. (The best way to notice this is to watch Catherine's growing-out bangs, which lay across her forehead.) I think the way this happened is that the film was flipped. (If you watch her earrings, one ear has visibly fewer piercings than the other; the piercings appear to move from ear to ear also.)