David Mailers apartment in season 1 has the number 16 on the door, but in season 2 it is the same interior but number 14 on the door.
When Walt is driving, the car used for the interior shots is a different vehicle than that used for the exterior shots.
When agent Forbes is having difficulty driving, he brings the SUV to a sudden stop in the parking lot. It makes the sound of tires screeching on dry pavement as it comes to a stop. But the pavement is all wet from actively falling rain, which would prevent that sound from occurring.
The timeshare salesman uses a key card to lock the room. Key cards aren't built to do that: they only unlock doors. The doors are either left to lock or remain unlocked by default when they close and the key card is used to open them.