Season 4 - Episode 4 "Thirteen"; The episode revolves around a man killing people with the same first names as the thirteen apostles (Mary Magdalene being the 13th), and killing them in a similar fashion in which the apostles died. At one point, Colby and David find a box with a mannequin's head in it. This is a reference to the film Se7en, in which seven people are killed for committing one of the seven deadly sins. The film ends with the main characters finding an actual head in a box. See more...
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Continuity: Season 5, Episode 6 "Magic Show": While Penn Jillette is performing the guillotine trick, in the reflection of the blade, a man is can be seen standing between Charlie and Nikki. He is not part of the scene, and is not visible in any regular shot.
Continuity: Season 5, Episode 6 - "Magic Show": ,When David is outside the club being interviewed by the media, he comments that "We're in the middle of an investigation." However, when the statement is later played during news coverage, David noticeably stammers and says "we're" twice.
Continuity: In 'The Janus List' (324), when David gets mad at Colby for being a spy, he says "You're not a spy, you're a damn traitor". But, in 'Trust Metric' (401), when Don is reviewing the tapes of Colby's interrogation, David says "You're not a damn spy, you're a traitor".
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