The War of the Worlds (1953)

Revealing mistake: In the first scene of the crashed meteor, on the extreme left of the scene where the smoke is, it seems to be billowing up from behind a stage wall, as there is a definite vertical line and a gap between the smoke and the left edge of the frame.

Movie Nut

Major General Mann: Pattern-wise, one lands, then two, making groups of threes joined magnetically. Is that possible?
Dr Clayton Forrester: If they do it, it is.

Trivia: The Flying Wing used to drop the atomic bomb on the Martians was the YB-49, an experimental bomber discontinued in 1950, three years before this movie was made. By the time the movie came out all YB-49s had been scrapped.