Marvin's death is interestingly not shown on screen, with the camera cutting away to the outside of the car when he is shot. The majority of the violence in Pulp Fiction is implied in the same way, with Tarantino opting to use cutaways and long shots to underplay the actual violence occuring. Because of this, this allows us as an audience to take the violence even less seriously since we are not actually shown the actual bloody images of it. Instead, we follow the quirky characters into the absurd situations that follow.
What makes Pulp Fiction so unique is that it follows these kind of absurd events and takes them all the way to their natural conclusions. Quentin Tarantino even milks a scene like Vincent Vega and Jules washing their bloody hands after accidently shooting Marvin and brings out the absurd humor in the situation, allowing our reaction to the violence to be laughter rather than horror. Jimmy, a friend of Jules, is sensitive to hosting these two bloody hitmen since his wife would divorce him if she were to ever find out. Jules reaction to Vincent carelessly wiping his bloody hands on a towel is humorous, mainly because his general attitude is not really of one who actually just witnessed a brutal accidental death but instead someone who is eminently concerned with not getting blood on his friend's towel. His pop culture reference to Maxipads adds even more absurdity to the situation.