Continuity mistake: Scene where the Wanderers are driving and get lost, eventually running into the Ducky Boys. The front windshield has a crack in it that appears and disappears, and likewise the wipers often change position. Since the Wanderers rumble with the Ducky Boys all around and on the car, it is likely the windshield cracked and shots of them driving into the wrong part of town were taken before AND after that fight.
Factual error: The African American gang the Del Bombers are all wearing Afros. This is 1963 and it would be another 3 years before you would even see these on Black leaders like Eldridge Cleaver and Stokely Carmichael. The only way kinky curly hair was worn back then was very short...later known as a Caeser. Worn any longer would have usually been processed. Some members of the same gang are also wearing open African shirts. These were not available at all until the mid to late '60s and were not worn in the Bronx at all until the early '70s. I think whoever outfitted these guys had the Back To Africa movement confused with the Nation Of Islam which was the only Civil Rights affiliated organization, besides Dr. Martin Luther King's, around at the time and that they wouldn't have belonged to anyway.