Factual error: Steve McQueen remarks that the chunk of meteorite is hot - though this is a common misconception (and probably belongs on several movies' boards), meteorites are almost invariably cold, given that by the time they hit Earth their frigid inner layers are exposed by the friction of air drag. (00:20:40)
The Blob (1958)
1 factual error - chronological order
Directed by: Irvin S. Yeaworth Jr., Russell S. Doughten Jr.
Starring: Steve McQueen, Aneta Corsaut, Earl Rowe, Olin Howland
Continuity mistake: When everyone is running out of the theater, a woman with a red belt and yellow purse can be seen exiting with the other terrified patrons. A few seconds later, the exact same woman is seen running out of the theater again.
Steve Andrews: You know, plenty of people in their right minds thought they saw stuff like flying saucers. The light was just right in the angle of the imagination. And oh boy if that's what this is, this is just an ordinary night, and you and I are going to go home to sleep, and tomorrow the sun will shine just like yesterday, good old yesterday.
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.