In Down (2009) and Breakage (2009), it is established that Jesse's dealers were selling meth for $2500/ounce, of which Walt and Jesse kept $2000, split evenly between them. Then in Negro y Azul (2009), Walt tells Jesse to raise the prices. Here when Walt asks Jesse what they're selling meth for these days, Jesse says $40,000/pound, i.e. $2500/ounce. Walt looks surprised that it's so high, to which Jesse replies, "Hey, you said raise the prices." But that figure (which based on Walt saying, "minus distribution charges" while performing his calculations is the street price) and the math on each of them making $672,000 for 42 pounds of meth shows that the street price is still $2500/ounce and that he and Jesse still keep $2000 of that - exactly the pricing they started with.
When Walter and his family are receiving the results from his scan, Dr. Delcavoli's hands change positions from folded in front of him, to his left hand behind the medical folder when the camera cuts back and forth between shots.
The copper wires Walt uses in his battery would be large enough to trickle charge the camper's battery (over many hours), but the wires certainly aren't large enough to carry the roughly 100 amps needed to turn the starter motor.
When hooking up the chemical battery White identifies the positive as "cathode" and negative as "anode." This would normally be backwards, but Walter is making a galvanic battery rather than an electrolytic one, and in galvanized batteries the cathode is the negative side.
The methylamine barrel has a NFPA (National Fire Prevention Association) warning label on it, as it should, but the squares on it aren't filled out.
When Walter and his family are receiving the results from his scan, the phone on Dr. Delcavoli's desk is not connected; there is no wire leading to it, and the display is inactive.
When Walt is entering and leaving the airport in the process of evading Skyler, crew are reflected in the glass automatic doors.