An interesting theory about character duplication in Tarantino’s films in the comments at io9 by Spangarang
I’ve always imagined that Jimmy (QT’s character) from Pulp Fiction is the same guy as Mr. Brown in Reservoir Dogs. Also, I think Mr. Pink (Steve Buscemi) is the same character as the Buddy Holly waiter in Pulp Fiction. He’s so paranoid about people knowing who he really is, he vehemently objects to tipping in the diner lest anyone find out he’s actually a waiter himself.