Continuity mistake: When they start the 18th hole of the last round, the sun is just starting to set (over the Atlantic Ocean, no less). When they get to their tee shots to hit their second shots, it is already pitch black. This could only be a matter of couple of minutes to walk to their next shot. And, yet, at the very end when Will Smith hears the roar of the final shot, he's walking along the beach into the setting sun?
Factual error: When the second round of the tournament is starting and Bagger Vance is telling Rannulph Junuh about 'the field', just after Bobby Jones has taken his tee-shot, Bagger hands Junuh a ball and tee. The tee is a red plastic 'castle' style tee. Apart from being illegal in tournament play, I'm pretty sure they weren't around in the 1920's.