When Finch and Fusco are talking out on the street they are shown completely in shade during their close ups. But when they are shown from the Bridegecam perspective, they are both out in the sunshine.
Reese scolds Leslie and says "by simply following orders without questioning them, you destroyed this town and deserve what's coming to you" but Reese himself also followed orders many times without questioning when he was working at the CIA as well as military. He would have understood that sometimes you can't question the orders you've been given.
In the basement, Silva uses a silenced gun. Police officers don't get issued silencers.
At 32:19 in the episode, when Det. Silva takes off her shirt in her bathroom, the cameraman's arm is visable in the mirror for a second.
At 34:30 Reese has extended the stock on the MP7 and the fore-grip, but still has the sights folded down for use as a pistol.