The screenplay appears to have borrowed several plot elements from the 1973 German TV miniseries Welt am Draht (World on a Wire), including a computer simulated world that's indistinguishable from reality to its inhabitants; unique self-aware computer programs who recognize the artificial nature of the simulated world and know of the real world's existence; and real world people who enter the simulation as avatars of themselves and return to the real world by making a phone call.

Film

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