When Professor Figueroa finds the door to the secret library, before he enters, he wears glasses. In he next shot, as he enters the door, the glasses are gone, but they come back some shots after.
In the final garage scene, the height of the camera has changed from approximately waist level to head height.
At 54 min the door Chema is trying to break into has the handle on the left hand side. However, when he opens the door and we see him from the inside, the handle has switched to the opposite side.
When Angela runs out of Castro's office, a boom mic is reflected in the door, just before he yells to her.