When Walt arrives to warn Badger and Clovis that the DEA is looking for the RV, the RV door is open and there is duct tape on the inside, covering the bullet holes. Later, when Hank arrives in pursuit of Jesse, he pulls duct tape off the outside of the door and beams of light shine through to where Jesse and Walt are hiding. The duct tape on the inside of the door should still be there.
When Walt explains to Clovis that they need to eliminate the RV he opens the RV door. In subsequent shots the door should remain open, but it visibly alternates from open to shut and back.
In the earlier seasons, Walt wears bifocals. In this season he is wearing single focal length lenses.
In the restaurant, Gus and Cynthia area talking. She is standing to his right. The Salamanca brothers walk in. Next shot, she is to his left.
Walt never received any information as to where the RV is located but finds it anyway. However, Jesse would have told Walt in the past where he had stored the RV which would make it a logical place to assume it was still located.
When Walt arrives at Clovis' repair yard he quickly exits his vehicle to encounter Badger and Clovis. After he jumps out a crew member is seen laying down in the front seat of Walt's Aztek.
When Walter is driving Walt Jr. to school, there are several instances when the side-view mirror on the passenger side of the car is visible. Although Walt Jr. has his window up, there is quite clearly someone sitting in the rear passenger seat resting their arm on the window.
When Gus is signing on a clipboard in his restaurant he uses the back end of a capped pen.