Continuity mistake: When Wayne pulls back the blanket to look at Piney's body, he doesn't cover it back up but when Wayne stands up, Piney is covered up again. Wayne is on camera the whole time so he couldn't have covered it back up.
Continuity mistake: The car shown in the scene when Jax and Tara are driving to Oregon is a Jeep Grand Cherokee. When at the gas station and in the park, the car has reverted to the Ford Edge that Tara is seen driving throughout the season. (00:06:25 - 00:15:30)
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.
Burnt and Purged Away - S4-E12
Continuity mistake: Near the start, Jax Teller's hat continuously turns around over the course of 30 seconds. (00:04:15)
Suggested correction: You can never assume how someone would heal or swell.
Clay beat her severely. Perhaps you should watch the scene.