What They Saw in Southie High - S1-E2
Other mistake: Agent Rohr asks who the cold case is related to. A dossier is given to him and the front cover contains a photograph and the name "Kanicki, K". Agent Rohr says "Kelly Kanicki" but there was no indication of the full name, just the initial. (00:08:30 - 00:09:00)
The Deaf Sage of Pompeii - S1-E9
Factual error: This show takes place in 1992. The officer sitting down has a Glock generation 3 handgun with the finger grooves on the frame in her holster. This is the third generation of Glock, which wasn't available until 1998. (00:51:50)