The building used to film the school scenes was used to film the police station scenes in The Fall (2013), also starring Gillian Anderson.
Mediator 452 uses the same voice modulating effects found in the video game Portal (2007) for the character GlaDOS.
The robot's cube shaped spaceships is a plausible nod to the Borg Cubes in Star Trek: The Next Generation (1987) and Star Trek: First Contact (1996).
This movie has some similar plot points and designs with Oblivion (2013): -A group of machines from another world comes to conquer Earth. -There are not alien beings, just robots. -There are cube shaped alien ships flying around Earth keeping tabs on the planet. -There are flying drones that fly around the cities looking for any humans that escaped. -Exist groups of humans that have escaped the robots, and are are living in a secret area of the forest. -Both movies end in a similar way with the outcome of the machines, being almost the same.