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.
In SONY's office, where she wasn't supposed to sit, Angela drinks a cup of water while searching XT-500's buying log.
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.
She drinks a glass of water in an office in which she wasn't supposed to sit while she searches for the buying log. Imagine if it's the worker's cup of water.
When Angela runs out of Castro's office, a boom mic is reflected in the door, just before he yells to her.