Continuity mistake: When Marlon Brando is gunned down at the fruit stand, he drops the bag of fruit he just bought. However, when he's collapsing against the car, the bag of fruit is now on the hood of the car. (00:43:05)
Continuity mistake: When Milo is walking with the ladder and trips, his hat falls off. The hat is couple of yards away from the spot where it first landed in the next shot. (00:37:10)
Revealing mistake: During the iconic dojo brawl scene, Bruce Lee at one point picks up two men and whirls them around. It's obvious in the wide shot that they are just dummies.
Continuity mistake: When Captain Bollin is questioning Shaft in his office, his hand position between shots is not always consistent. Best example when he asks Shaft about Mascola: he is leaning with his left hand on the top of the file cabinet, but he's shown rubbing his hands together in the following shot. (00:29:40)