Factual error: In the opening scene for the episode, a character commits suicide by electrocuting themselves with a defibrillator. The device used was an AED (automated external defibrillator) which analyses the electrical rhythm of the heart and only delivers a shock when the heart rhythm is ventricular tachycardia or ventricular fibrillation. In this case, the device would not have delivered a shock as the person did not have both ECG electrodes attached and therefore would not have detected a cardiac rhythm. The person would also have had a normal heart rhythm.
Continuity mistake: In the scene where the shootout starts in the previous episode, Walter is handcuffed in the back of the SUV and trying to get to the floorboard to avoid the gunfire, and his glasses eventually fall off. After the gunfight when he is yelling at Jack from the back of the SUV, his glasses are back on his face, which would be hard to do handcuffed.
Visible crew/equipment: In the flashback scene where Jesse breaks into the Whites' house and starts pouring gasoline everywhere before Hank stops him from burning the house down, you can see the outline of a crew member exiting the right side of the dark living room at the beginning of the shot.
Continuity mistake: When Mike and Walt and Jesse are driving toward each other in the desert and they both spin out to avoid a wreck, Mike can be seen leaving his Cadillac, which is in the middle of the road/tire tracks, and the front wheels are in the tire tracks. In the middle of the scene, the Cadillac has moved to the right slightly, but is still in the road. At the end of the scene when the three drive off together, the Cadillac is seen off the road, having moved significantly to the right without a driver present.