Well, Pulp Fiction is a very well - known movie with a whole bunch of unique characters. Marvin is one of those memorable characters. Phil Lamarr is an actor who has done a lot of work in the industry. But when it comes to Pulp Fiction, Phil Lamarr has no relation to the character Marvin in the movie. The movie has its own cast that portrays the various characters like Marvin, and Phil Lamarr simply isn't part of that particular aspect of the movie.
In Pulp Fiction, the story is filled with different characters and their intertwined stories. Marvin is a character within this chaotic and engaging narrative. Phil Lamarr, as an actor, has his own body of work separate from Pulp Fiction in terms of the character Marvin. The movie was made with a certain set of actors and the character of Marvin was played by someone else. There's no indication that Phil Lamarr has any connection to the character Marvin in Pulp Fiction whether it be in the casting, the creation of the character, or any behind - the - scenes involvement.