Crazy Handful of Nothin' - S1-E6
Continuity mistake: When we see the red liquid being injected into Walt, there is a lot of liquid in the syringe. Camera cuts and there is suddenly much less. (00:18:10)
...and the Bag's in the River - S1-E3
Continuity mistake: When we see the basement while Krazy-8 is alive, we can see that there is no light coming in from outside or any windows. When Jesse returns and goes to the basement all of a sudden there is loads of daylight streaming into the basement. (00:42:10)
Continuity mistake: In Season 4 we see Mike gets shot in the ear and and has a flap of flesh hanging off. In this episode, there are no marks or deformities on his ear.
Problem Dog - S4-E7
Continuity mistake: When Jesse is emptying the cigarette, his fingers are right at the end of the cigarette. Camera cuts and now they are up the other end. (00:19:20)
Box Cutter - S4-E1
Continuity mistake: During the diner scene when Jesse is eating, Walt asks him how he's doing. Jesse's head changes positions several times between shots. From looking out of the window, to back down at his plate, to back out of the window, to straight ahead again, all between shots.
4 Days Out - S2-E9
Revealing mistake: There are no water cooling tubes attached to the reflux condensers. Reflux condensers do not condense without cooling. (00:15:40)
One Minute - S3-E7
Other mistake: At the end, we see the gunfight between Tuco's cousins and Hank. Several shots are fired, cars smash into each other, a woman runs off screaming. So not a "quiet" attack. However, as the camera zooms out to show the carnage, 2 people who are not involved in the attack, are just stood talking in the car park. A bit odd since there has been a very clear shoot out. (00:44:50)
Suggested correction: Nobody is actually standing in the car park. People are standing around on the sidewalks talking to each other about what was going on, keeping their distance. Personally I would keep a bigger distance, but whatever distance they feel safe with.
Continuity mistake: At the end of the episode when Walt and Jesse are leaving the junkyard, the camera pans to Tuco and Ganzo watching them drive away. However, this is at the same time Ganzo is moving No Doze's body and is subsequently crushed by a car.
...and the Bag's in the River - S1-E3
Other mistake: Walt pushes water jugs and several items toward Krazy 8 who is locked in the basement. Notice the ground has been disturbed where the jugs slide, indicating previous takes.