Continuity mistake: In the car driving after seeing Saul, Skyler tells Walt "This is what happens when you decide to pay the bills with drug money" The shot from behind shows Walt's head completely in the shadows. When it cuts to a closer angle, suddenly he has light around his head and part of his neck with only a small shadow cast on him.
Continuity mistake: When Jesse and Andrea are making out on the couch, they discuss having a bear. And she mentions she's cleaned out of anything else. During this sentence, they are positioned where Jesse is leaning forward looking down at her. But mid sentence there is a cut, and suddenly he's leaning his head back with her looking down at him.
Audio problem: After Walt Jr and Skylar leave the room, Marie starts to leave. The camera is focused on Hank once she walks off screen and you can hear the sound of the door closing behind her. It then cuts to showing her suddenly just getting to the door and opening it to walk out.