Plot hole: When the guys break into the safe house and free the witness against Bobby, they are wearing masks to hide their identities. Yet after freeing the witness, Jax and Tig decide to get involved in a fist fight inside the house which would leave their DNA all over the place. Since both are undoubtedly on the police database, it would take no time at all for the police to find at least two of the culprits who assaulted two officers, an ATF agent and intimidated their star witness.
Plot hole: Tig thinks it's Opie driving the truck. Problem: When Donna stops at the stop sign, Tig has a clear view of the driver. Also, when he pulls up behind her, it's obvious that Donna is much shorter than Opie and isn't wearing a hat like Opie always does. Tig doesn't realize it's Donna until he pulls up beside her.