Deliberate mistake: When the investigators are in the basement wine cellar, they turn on their flashlights to illuminate the pitch black area as they walk around. However there is a light source moving with the camera shining on them as they are casting a shadow behind them.
The Mentalist (2008)
1 deliberate mistake - chronological order
Starring: Robin Tunney, Simon Baker, Owain Yeoman, Tim Kang
Green Thumb - S6-E10
Character mistake: When Kim is trying to convince Lisbon to help the FBI on their case, she says Jane stopped the ten-year reign of a mass murderer. Red John was a serial killer, which, by the FBI's definition, is a criminal behavior distinctly different from mass murder; he may have had a large number of victims, but he killed them either one or a couple at a time, with a cooling-off period in between, not all at once.
Kimball Cho: What do you need?
Patrick Jane: Backup.
Kimball Cho: I don't like it when you say you need backup and nothing's happened yet.
Trivia: At the time the episode was shooting, Lucy Davis, who plays the victim's widow, was married to Owain Yeoman.