Revealing mistake: At the end of the episode when Tuco shows up at Walter's house in the backseat of Jesse's car, he tells Walter to get in. As they drive off, the shot pans out to show the street sign across from Walter's house. The sign says Piermont, which is the real name of the street. In the show, the Whites live on Negra Arroyo Lane.
Factual error: Hydrofluoric acid is so dangerous that no high school chemistry lab in the US would have a thimble full of the stuff around, let alone gallons. While it's incredibly toxic it's also a very poor choice for getting rid of bodies, which Walt would know.
Add timeDenis Ouellette
Continuity mistake: In the scene where Walt and his wife are talking at the breakfast table the milk carton is facing a certain way. Five seconds later it has completely turned the other direction. The wife is holding a baby, and no sound is heard to indicate that she moved the milk carton in any way.
Visible crew/equipment: In the scene at the very end, Walter breaks into Jesse's house to take all of their product. As he leaves the kitchen, just as he passes the fridge, Jesse (passed out in this scene) or a crew member can be seen peeking around a doorframe.
Continuity mistake: Walt Jr gets Walt Sr to drink apple juice in the hospital, he takes a drink from a cup that's 3/4 full, then sits the half full cup down. Hank comes in and camera focuses on him. When the camera returns to a wider shot the cup of apple juice is now 3/4 full again.