Audio problem: Angus is clearly not playing the mandolin and guitar at various places in the show.
Continuity mistake: Elsbeth is sitting at a bar having a beer in a bottle. The label is facing away from her as she talks to the bartender. When the bartender walks away, the bottle has turned, with the label now facing her. (00:44:44)
Trivia: Elsbeth suspects that a "suicide" is actually a murder because the victim had recently used teeth whitening strips. This is similar to the last Columbo episode, "Columbo Likes the Nightlife", where the "suicide" victim has recently used mouthwash and trimmed his toenails. In each case they didn't believe a person would do those things right before taking his or her own life. Elsbeth also often turns around with "just one more thing" after walking away, just as Columbo often did.