At 10:26, when Diggle is walking towards the cabinet, the lamp on the cabinet is on. When the shot changes as he starts searching the drawers, the lamp is off. At 10:51, when Diggle stands up after being caught by Bear, the lamp is on again.
At 34:10 when Felicity is arming the bomb she is holding the tablet upside down, as the messages "Bomb Armed" and "Access Granted" flash on the screen the wrong way up.
In the second "flash forward" it starts as a shot behind the clear monitor displays, panning around to Felicity and Dinah, discussing events in front of the computer, but the initial shot shows the screens forwards, rather than backwards, as they would appear from behind.