Back Door is a form of malicious feature in which the program is configured to respond to commands sent to it from the developer. A Universal Back Door is an ability of the developer to remotely change the program to do anything the developer desires it to do. Sometimes Universal Back Doors are called "Auto-Update".
This comment thread is for people to document various implementations of this malicious feature.
It seems like the movie Trachtenberg was going for here was way too risky and way too ambitious for a studio to green-light it normally. But if he can do that on a fraction of budget. As animation. And not a budget, something like Pixar uses for their ultra-realistic stuff and fluent motion. But on a fraction of that. He can use the trend of animating on-twos and making everything painterly, to cut all of the corners necessary to make this insane movie with the small amount of money that he is given.