The car that killed the young boy in the opening minutes of the film turns up again twenty minutes later parked in front of the undercover cop that FBI man, Agent Rogers asked the Poice to help watch the Panthers.
At a party, a Black Panther member is shown playing a cream colored guitar with a Floyd Rose tremolo and locking nut. Floyd Rose didn't invent the locking tremolo system until 1977. The film is set in the mid-'60s.
When Detective Brimmer is chasing Judge, he makes a radio call saying the he is running east on Market Street, in Oakland, CA. Market Street in Oakland, runs South to North. There is no way to run East on Market Street.
At the school, when they are rallying for more members.