Continuity mistake: During one of the pool scenes, balls disappear and change position between cuts.
Continuity mistake: While Tony drives his car to the pool hall with Charlie and Johnny Boy, in the initial overhead shot the car's front license plate is on the car, there are hood vents below the windshield, and there is only one sticker on the windshield. Then when Tony turns the corner the front license plate and hood vents are gone, and there are two stickers on the windshield. (00:27:00)
Continuity mistake: During two successive scenes, when Michael and Tony con the boys looking for fireworks and also when they're with Charlie at the movie theater, Tony has the taped bandage around his right pinky and hand. The problem is in the next scene at the pool hall Tony's hand is fine, and it's during the brawl in this pool hall that Tony injures his pinky, which requires it to be bandaged later on. (00:23:45)
Continuity mistake: At Joey's pool hall Jimmy is wearing a solid dark blue tie, and when they all return to Tony's bar after the brawl (still making "mook" comments) Jimmy's tie has a dark pattern, but when they all walk to the back room Jimmy's tie now has broad red stripes. (00:36:10)