Question: When the gang explore the ruins of the city, you can hear a low pitch humming noise. What was making that noise?
Journey to the Center of the Earth (1959)
1 question
Directed by: Henry Levin
Starring: James Mason, Diane Baker, Pat Boone, Arlene Dahl, Alan Napier, Peter Ronson, Robert Adler, Thayer David

Revealing mistake: A boulder tumbles towards James Mason and his party though a cave. With all the smashing against the walls and floor of the cave, the boulder stays entirely intact. However, just before the boulder hits a wall with two tunnels while flying through the air, the boulder now shows two majors fractures that were unseen earlier. The fractures were added to the boulder to give it a more dramatic impact by it breaking up with one piece nearly striking James Mason. (00:55:50)
Sir Oliver Lindenbrook: Are we to be abducted every day in Iceland?
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Answer: It's just an added sound effect that foreshadows an ominous event (the giant reptile) that is about to happen. It's not meant to be anything naturally occurring.
raywest ★