Continuity mistake: When the prisoners in the confinement holes talk clinging from the bars at the top, Jim Brown's hands are one bar apart in the overhead shot, 2 bars in close-ups. (00:00:50)
Revealing mistake: At the beginning of the movie, the coked-up sailor is shooting from a rooftop and screaming various racial slurs. Despite that, there's a big crowd building. When he shouts "Come and get me, honkies!" you can see people running way before he pulls out of the gun again and shoots. Not only that; some of the extras are just enjoying themselves and not keeping a straight face, far from being scared. (00:01:00)