Factual error: The calendar in the police office indicates Tuesday January 27th and Thursday January 29th. That was in 1970, but this story takes place in 1971.
Shaft (1971)
1 factual error - chronological order
Directed by: Gordon Parks
Starring: Richard Roundtree, Moses Gunn, Charles Cioffi, Christopher St. John
Revealing mistake: When Shaft and his buds are sneaking into a building to save Bumpy's daughter, a pedestrian momentarily comes into the shot and then quickly steps out when he sees the camera crew. (01:18:45)
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Suggested correction: I believe the entry refers to the initial rescue attempt, at 1:18:45. I am not entirely convinced that this is a legitimate goof though: the man sees 3 guys peeking into an alley, and he seems to rather stop and backtrack to check out whatever they are looking up, the exact opposite of 'stepping out'. It's still a rather amusing detail, though.
John Shaft: When you lead your revolution, whitey better be standing still because you don't run worth a damn no more.