When James walks to the private jet after talking to Velma at the airport, modern cars can be seen parked behind the control tower. Later, when the police are chasing James in his truck through an industrial area, modern cars can again be seen parked in the background.
At the T.A.M.I. show, James walks by the Beach Boys dressing room. They are wearing "Pendleton" long sleeve shirts, which they wore earlier in their career. At the T.A.M.I. show they wore their trademark short-sleeved striped shirts, which they had been wearing in concert since at least March 1964.
When James Brown recorded "Say It Loud (I'm Black and I'm Proud)" in 1968, he recruited neighborhood children to sing backup. Ironically the children were mostly, if not all, white and Asian with little or no black kids.
When James Brown lands in Vietnam, he is greeted by an Army private wearing ribbons on his fatigue uniform.The Army has never worn ribbons on fatigues. The ribbons are also in the wrong order of precedence (campaign ribbons higher than personal decorations such as the Purple Heart),
When the madam pays James, she peels off a roll of $1 bills.They're federal reserve notes with a green seal, introduced in the early 1960s. The bills should've been silver certificates or US notes with blue or red seals.