Deliberate mistake: There are no lights ever to be found in the underground world and the ceiling is literally the surface's ground, but there is still a perfect level of lighting regardless.

Beneath the Planet of the Apes (1970)
Plot summary
Directed by: Ted Post
Starring: James Franciscus, Kim Hunter, Maurice Evans, Linda Harrison
In an effort to find the missing astronaut Taylor (Charlton Heston), James Fransiscus goes on a rescue mission to the planet of the apes. Using the information he receives from the ape village that Taylor escaped from, Brent locates him in an underground fortress in the forbidden zone guarded by telepathic humans.
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Chosen answer: When Brent and Nova secretly return to Ape City, they are discovered by a gorilla soldier who shoots Brent. He then takes them to Zira and Cornelius' house.
raywest ★