In 'Pulp Fiction', Brad Pitt had a role. 'Check out the brain on Brad' might imply looking into how his character was written and portrayed. His character might have had a certain way of thinking or making decisions that the statement is urging us to explore. For example, his actions and reactions in different scenes could give us an idea of what was going on in his 'brain' so to speak. It could also be a bit of a play on words or a very insider - type of comment among fans of the movie.
This phrase could be a call to understand Brad's character in 'Pulp Fiction' from a psychological perspective. When we 'check out the brain' of a character, we are trying to figure out what makes them tick. In the context of the movie, Brad's character might have had hidden motives, complex emotions, or unique ways of interacting with other characters. By examining these aspects, we can get a deeper understanding of his role in the overall story. It might also be related to the overall mood and atmosphere of the movie that influenced his character's mindset.