One key point in the 'Parent Guide for Pulp Fiction' is the level of maturity required to understand and process the movie. It's not just about the obvious elements like violence and bad language. The movie also plays with time and narrative in a complex way that demands a certain level of intellectual engagement. The characters are morally ambiguous, and the movie doesn't really offer simple lessons or role models. So, it's a movie that really should be reserved for more mature audiences, and parents should be aware of these aspects when considering if it's appropriate for their kids.
The key point is the violence. There are a lot of violent scenes which are not suitable for kids. Another point is the bad language. It's full of swear words. Also, the movie has a complex structure that might be hard for children to understand.