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.
Continuity mistake: When season 1 left off, at the very end of the last episode, Tuco examines the blue meth seriously and says, "What is this shit? This is blue." At the start of season 2, the scene is repeated, only when Tuco sees the blue meth, he laughs and then says "What is this? It's blue." Even though its supposed to be the same scene, the dialogue is slightly different and Tuco's demeanor is completely different.