The battery clamp on the Improvised Explosive Device (IED), carried by Kevin, served as a dead-man switch, that is if he were let go of the switch in the event of his demise, the device would have been detonated.
Cooper Andrews, who played the Bomb-Technician Reggie Lee, might be more well-known as the character Jerry, Ezekiel right-hand man and protector of "The Kingdom", in "The Walking Dead (2010)". Off-camera, he has developed an expertise in the martial arts and hand-held combat weapons.
Marcus Giamatti appeared in Season 1 Episode 6 (L.D.S.K) of Criminal Minds which starred Shemar Moore
The building that explodes in the beginning of the episode also exploded in Sweet Sixteen (2010) and is staked out by Dead Man Talking (2004).