In the aerial shot of the Sons and Mayans facing off in downtown Charming it is clear that the end of the block has been barricaded. However, as the camera scans the Sons and goes to a close-up of Clay a small white vehicle and a dark pickup are clearly seen entering the street. In the next shot the barricades are again visible and the vehicles have disappeared.
At the beginning when the club members are gathered around the front of the police station Unser comes out to talk with them. When Unser is just a couple of steps outside the door you can see Jax throwing a cigarette away to the right of the screen. When Unser is then all the way outside in the sun light Jax is standing in front of him smoking on the tail end of another cigarette and then throws that butt down, even though he had just thrown a cigarette away 2 seconds earlier when Unser first came out the door.
When Ethan Zobelle and the Mayans are leaving the cigar store an overview shot over the street is given. You can see Juice calling Clay in order to inform him about it. When the shot ends he still has his phone next to his ear. In the following shot Juice is shown in a close-up starting to make this call again.
Outside the police station right near the beginning Jax throws his cigarette away as Unser comes out. The camera changes angles and Jax throws his cigarette away a second time.
When Edmond Hayes checks his gun in the bathroom, it can be seen that the clip is filled with real copper-jacketed bullets. When Stahl shoots him later with that same gun, she claims it was filled with blanks by the FBI. Blank cartridges have flat faces, not rounded copper ones.
When Stahl shoots Edmond the first time with the "blank", the agents outside do not hear the shot. When she shoots him later with her own gun, the agents outside immediately radio her to report that they heard shots.
ATF Agent Stahl's story of how the shooting of Edmund, and Polly happened would not hold up once the forensic evidence had been processed. She shot Edmund in the back with her gun, but Gemmy shot Polly with her personal weapon. Stahl's story would fall apart once ballistics from the two bodies were compared, and it was noted two different guns were used.
The ambush set up for Zobelle near the end had SAMCRO firing at each other like this --> <--...a group this experienced would have not made this mistake as it opens up its members to be hit by each others rounds. Instead, a proper ambush is set up in an L shape.