When Carl Fisher - played by Frank Orsatti - jumps from a balcony, he drops the gun he's carrying in his right hand. In the next scene, as he crashes through a gate, the gun is back in his right hand.
When Steve is talking to Lt. Devitt in the station, Steve's arms jump from his hips to crossed over his chest between shots.
The position of the beacon upon the roof of the detectives' car changes between shots.
Dozens of spectators on the streets are closely watching the filming just before Keller enters the subway station towards the end. A common problem for this show.
Officer 'Gus' is shot, a serious wound - eventually causes his death - but when he's undressed for surgery, no blood anywhere on his body.
While rousting Eddie Suslow, Stone mistakenly states the robbery happened at "4:45 today," instead of the correct "yesterday."