Malcolm watches television news footage of race riots, including the March 1965 attack on the Edmund Pettus Bridge in Selma, Alabama and the 1967 Newark, New Jersey Riots. Both incidents took place after Malcolm was assassinated in February 1965.
In the "Russian Roulette" sequence, when Malcolm holds the gun to Rudy's face, the bullet is in the chamber to the right, which Malcolm had just "fired" at his own head. Since the gun didn't fire, the chamber should've been empty.
When Benjamin leaves the coffee shop after talking to Malcolm X about joining the Brotherhood of Islam, the bodyguard is on his left. When the camera angle is changed toward the front door, the same bodyguard is on his right.
Malcolm and the other train porters and servers listen to the Joe Louis vs. Billy Cohn fight. Their first fight was June 18, 1941, when Malcolm was 16 and not working for the New Haven Railroad. Their second fight was in 1946, after Malcolm had left the railroad.