Other mistake: In the scene where everyone is running out of the theater most are cracking up. (01:11:00)
The Blob (1958)
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Directed by: Irvin S. Yeaworth Jr., Russell S. Doughten Jr.
Starring: Steve McQueen, Aneta Corsaut, Earl Rowe, Olin Howland
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More mistakes in The Blob
Steve Andrews: You sure you want to go with me?
Jane Martin: Yes.
Steve Andrews: I wouldn't give much for our chances, us running around in the middle of the night, looking for something that if we found it, it might kill us.
Question: The movie was made in 1958, why does the calendar in police station show July 1957?
Answer: Because movies aren't always set in the year they're released. Absent any conflicting information, the assumption must be that the events of the movie take place around July 1957.