When Tuco is aiming for the cow in one scene, he has a scope in his rifle. In the next scene you can clearly see no scope on the rifle, just the carrying handle.
After Hank shot Tuco and Walt and Jesse are watching from a distance, Hank walks into their view and Tuco has his face towards Jesse's car, but when the camera switches back to Hanks point of view Tuco is now facing the opposite direction.
After Tuco inspects the contents of Walt's and Jesse's pockets, they retrieve their belongings from the coffee table. In subsequent shots, their belongings are off the table, back on the table, then off again.
When Walt pulls into his driveway, fearful that Tuco has come to harm his family, the car is parked crookedly. When Hank comes to check things out the next morning, the two cars in the driveway are parallel to each other.
Starting at 3:35 Hank is seen rallying his DEA agents to go after Tuco. The ID badge around Hank's neck flips several times between cuts, alternating between his photo and a horizontal green stripe on one side, and a blank all white backside with a vertical magnetic stripe on the other.
Hank ask Jesse's mother about his car, an '89 Chevrolet Monte Carlo. The Monte Carlo stopped production in 1988 and resumed again in 1993. Also, the mirrors are pushed back on the door, indicating it's an '83-'85 Monte Carlo.
In the shootout with Tuco, Hank's Glock Model 22 makes two clicking sounds as he pulls the trigger twice after he empties his first magazine. A Glock does not operate this way.
At 09:36 - A character somehow feels that it is important to hurl away a phone while in the middle of nowhere desert.
In the shootout between Tuco and Hank, when Hank runs out of ammunition and reloads, he puts in a new magazine but does not rack the slide. Therefore, there should not be a round in the chamber when he shoots Tuco moments later, and the gun should have dry fired (cycled without firing a bullet).
At the beginning of the episode the sound of Jesse's car hydraulics do not match the car bouncing movement.
Walt makes a big mess of the burrito that Tuco had just made; Tuco doesn't even notice.