Earth vs. the Flying Saucers (1956)

Plot hole: Carol and Dr. Marvin walk into The Internal Security Commission at The Pentagon and he's stopped by the guard and made to show his clearance. The guard looks at him intently but lets his wife in without any challenge or ID check. (00:27:20)

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Plot hole: After being denied permission to contact the aliens by himself, Dr. Marvin returns to his hotel and calls them up on the radio anyway and arranges to meet, despite not being allowed to leave the hotel. His wife says she overheard him say he's under orders not to leave and begs him to call someone instead: "Call Huglin". She shouldn't know who Huglin is because Huglin was only assigned to guard them as Marvin was being denied permission to contact the aliens.