Other mistake: After they trace the number from the vampire bar they bring Marla's roommate in for questioning. Calling a bar, that has zero connection to the murder, and asking for blood wouldn't make someone a suspect or be enough to bring them in for questioning.
Psych (2006)
1 mistake in This Episode Sucks
Starring: Corbin Bernsen, James Roday, Maggie Lawson, Dulé Hill, Timothy Omundson
Shawn Spencer: The spirits tell me your little pants are on fire.
Scary Sherry: Bianca's Toast - S1-E15
Trivia: In this episode, Chelan Simmons (Bianca), dies by getting electrocuted. In Final Destination 3, her other film, she also dies by getting electrocuted.
More questions & answers from Psych
Chosen answer: "Psych: The Musical" was supposed to air during the regular season 7 schedule, before Chief Vick is suspended and Jules discovers Shawn's lie, but the network decided to push it back to air as a special episode, sort of as a tie in with the holiday season and a lead in to season 8, which was to begin only a couple of months later.