Continuity mistake: When Basquiat is painting on a sign with a horse on it, he puts a white line through the horse. When Warhol has a look at it, the stripe no longer covers the horse.
Continuity mistake: When Basquiat is doing the large painting on the floor, part of the work in the top left hand corner disappears and reappears between cuts.
Continuity mistake: Rene and Basquiat are in the studio, Basquiat asks Rene what time is it and draws in chalk "Rene 5:11" on the canvas. But before this scene, Rene walks past the canvas where the quote is going to be written, and it's already there.