Continuity mistake: In the episode prior to this one, Clay severely beat Gemma in the face. Bruised and cuts. Swollen eyes. This episode, which is the next morning, her face isn't nearly as bruised - it sure wouldn't have healed that much overnight. And the swollen eyes aren't as bad either.
Character mistake: The nurse that was helping the doctor tend to Clay has blood all over her gloves. As she leaves the room, she takes off one glove. No hospital anywhere would allow doctors or nurses to roam the hall with bloody gloves and hands. It's a health hazard.
Revealing mistake: In the scene where Jax and crew go to help escort Tig after he ran into Laroy with a car at the cafe, they get caught in a traffic jam and have to drive on the breakdown lane. Jax shoots at the SUV with Laroy and kills the driver and the car slams into a car that is stuck in traffic, but there is no one sitting behind the wheel of that car.