Connections

The neural-machinery adult Jack is in, with the eye-covers, is directly inspired by and serves a similar purpose to the one in La Jetee.

Opening is a shot-for-shot homage to Persona's opening scene.

Behavior of the German doctor.

Cited by director. Sensory deprivation.

Includes a very obvious homage Evil Dead's iconic shot of camera racing forward, like the POV of a frightening entity.