Factual error: The final scene of the episode, the cousins are hiding with other migrants amid a farm truck's bales of straw. One of the migrants claims they are in Texas. However, the mountains in the distance are the Manzano Mountains which are just several miles southeast of Albuquerque, more than 200 miles away from the border with Texas and Mexico. The migrant claims he has gone through this route 3 times, so it is unlikely this would simply be a character mistake.
Continuity mistake: When Walter White is with the Neo-Nazis waiting for Jesse to appear, one of the thugs throws Walter's car keys and wallet on the pool table. Their position changes between shots, sometimes being parallel to each other, other times very far apart. (00:40:15 - 00:42:10)
Cancer Man - S1-E4
Character mistake: When Walt is in the bathroom using hydrogen peroxide to clean his leg wound he received from killing Crazy 8, he notices blood on his pants. He tries to clean the bloodstain off with a toothbrush. I think that any and EVERY chemist would know that hydrogen peroxide almost instantly removes blood stains from clothing. But, instead of using this somewhat common knowledge, Walt scrubs the stain with a toothbrush under the sink. Even if he had never heard of this 'trick', given the nature of H2O2 and Walt's understanding of chemistry, he would have realized this chemical solution immediately... Especially since he used the peroxide seconds before discovering the blood stain. (00:15:55 - 00:17:10)
Continuity mistake: Towards the end, Walter throws up on the ground. Long shot shows no vomit anywhere. (00:52:15)
Other mistake: Walt takes new-born Holly into the garage to show her the money hidden behind wall insulation. He enters through a door that doesn't exist in the interior of the house. (00:15:00)
Ozymandias - S5-E14
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.
4 Days Out - S2-E9
Visible crew/equipment: The boom mic is visible above Walter as he tries to convince Jesse he is too dehydrated to walk after they are stranded in the middle of the desert in the RV with a dead battery. (00:34:27)
Factual error: Walt and Jesse are fighting and Walt dislodges a copy of the videogame Rage from a cupboard. Rage was released more than 2 years after the time this episode was set. (00:44:30)
Negro Y Azul - S2-E7
Visible crew/equipment: When we are shown the blue truck at the gas station, there is an entire film crew reflected in the chrome bumper. (00:18:15)
Continuity mistake: When Jessie, Victor and Mike pull into Gus' chicken plant they pull up behind Gus' car, but when they get out the car is gone, and when they start to walk to the building the car is back.
A No-Rough-Stuff Type Deal - S1-E7
Visible crew/equipment: When Tuco is beating the other thug to death, the camera pans first on Walter, then Jesse. When it is on Jesse, the entire crew can be seen in the reflection of his sunglasses. (00:45:35)
Audio problem: Throughout the series the engine sound from Walt's Pontiac Aztek sounds like a 4-cylinder engine, but the Aztek was only ever available with a V6.
Other mistake: Walter's pants flying in the air defy the laws of physics. The RV is racing forward and the pants somehow find themselves in front of the RV floating through the air. One could say that the pants perhaps flew forward when the RV 'hit a bump' perhaps. However the RV would have to hit a considerable sudden stop to get the pants to fly forward. The RV then runs over the pants which have fallen to the ground from in front of the RV. This could be ignored as somehow possible due to some strange anomaly. Except near the end of the episode. We see the same pants fly off the mirror of the RV flying backwards. Making it impossible for those same pants to be run over from in front of the RV especially due to the speed at which they are flying backwards straight into the camera shot. (00:00:15)
Character mistake: When Walt steals the bottles of "hydrofluoric acid," they are misspelled on the labels as "hydroflouric." This misspelling is corrected when hydrofluoric acid reappears in season 4. This was corrected for some DVD releases but is still visible on some streaming services. (00:11:20)
Box Cutter - S4-E1
Continuity mistake: When trying to get Victor into the barrel, Walt sits against the barrel in one shot but is stood holding it in the next. (00:37:00)
Continuity mistake: When Walt throws the pizza on the roof, it lands 5 rows up from the edge. When the camera cuts to on the garage roof, it's only 3 rows up. Also the amount of topping changes between the angles. (00:34:30)
...and the Bag's in the River - S1-E3
Continuity mistake: When Walt is sitting on the overpass it is clear that his car is parked on the part that straddles the median between the lanes, but when the shot is inside his car the view appears as if he is parked directly over the right lanes of traffic. (00:43:50)
Revealing mistake: When Hank is summarizing what happened at the junkyard, you can see the big dead guy breathing. (00:42:00)
Suggested correction: He could have just been boasting, whilst not actually knowing where he is. He is just a kid after all.
lionhead
Worse than all of that, is the fact that you can't get directly from Mexico into Texas without traversing a river. There are no land routes.
There are no bridges?
lionhead