Other mistake: If the flying creatures sense heat, then the junkyard should have a lot of heat signatures, but the aerial photograph has none.
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Suggested correction: It wasn't an actual, fully operational junk yard with car crushers, cranes etc. It was just an area that the residents had designated a junk yard.
Other mistake: When Jack is using the chainsaw to dig Burt out of the Graboid, we do not see where he is cutting, but we do see sparks fly just before he stops and puts the saw down. The chainsaw angle does not match the sparks' direction.
