Yes.
He did graffiti of Jules and Vincent holding bananas instead of pistols.
Not kidnapped, actually, but held and tortured by racist perverts after they stumble into the pawn shop.
Marsellus Wallace (Ving Rhames), and Butch Coolidge (Bruce Willis) are tied up by Zed (Peter Greene from The Mask) and Maynard (Duane Whitaker). Butch gets loose and turns the tables on them.
Marvin, the survivor of the Brett shootout, is apparently Marsellus' informant in the drug gang.
He leaves with Vincent and Jules, but is accidentally shot before getting to his unknown destination.
He returns to collect his father's watch. In an earlier scene, a flashback from Butch's childhood, we see a character played by Christopher Walken give Butch the watch and tell him how he had received it from Butch's dying father when they were both in a Vietmanese Prisoner of War camp.
Laura Lovelace played the waitress at the coffee shop. At Jack Rabbit Slim's, Susan Griffiths played Marilyn Monroe and Lorelei Leslie played Mamie van Doren.
Harvey Keitel played Winston 'The Wolf' Wolfe in Pulp Fiction (1994).
Let's stay together
no, but he was a small character in another Tarantino movie, that Samuel L. Jackson also starred in, Jackie Brown.
No, it was Ving Rhames who appeared in Pulp Fiction.
The last scene shown is the scene in which Vincent and Jules get caught up in the robbery of the restaurant.
In the established chronological order, the last scene is when butch and fabian ride off on zeds motorcycle.