Other mistake: In the hospital, Barrett had his right arm in a sling and his lower left leg in a cast. When the police/ detectives were trying to find Barrett, one detective said Barrett could not have driven himself somewhere because he had "a cast on his leg." The cast was on the left leg, so Barrett could have driven using his right leg, as usual. Maybe he couldn't have driven with a cast on his right arm, but the detective gave the wrong location of the leg cast. (00:50:30 - 01:13:45)
Other mistake: The initial view of Barrett's hospital room shows the lower portion of an IV pole. Barely visible IV tubes are hanging down, alongside (or touching) the pole. After briefly shifting to Sonny, there is suddenly a full IV drip bag. The IV tubes are no longer flush with the IV pole - they stick out on both sides and loop at the bottom. Also, the IV drip is not connected to Barrett. (00:50:29)
