When Barnaby visits the jewelry company, he parks near the back door in the alley where the thief parked his van, then apparently walks down the alley and along the street to the front entrance. However, during a wide shot as he talks to Biddle at the intersection, it's obvious that there is no alley on that side of that block, just buildings all the way.
When Mitch drives away in the van after shooting Andre, Andre's body is lying roughly parallel with the car he was driving. The next morning, the police tape outlining Andre's position is at about a 45 degree angle away from parallel (counterclockwise).
During the actual robbery, Mitch puts the gun in his right hip pocket, takes off his mask and removes the plastic piece from his mouth all with his right hand. Later, when Mary plays back the recording of the robbery she secretly made, the gun is now in Mitch's left hip pocket and he takes off his mask and removes the mouth piece using his left hand.
Correction: The video was shot using the mirror so everything would be opposite.
Correction: The video was shot using the mirror so everything would be opposite.