 There is a persistent myth that that all the clocks in the movie are  set to 4:20 (although, certainly all the clocks on the wall in the  pawn shop are set to 4:20). However, in at least two scenes it is  obvious that this is not the case. In the "Bonnie Situation" while  Jimmy, Vince and Jules are drinking coffee in the kitchen, the clock  clearly reads 8:15. Secondly, when Vince and Jules go to retrieve  the briefcase, it is "7:22 in the a.m.". The significance of the  time 4:20 is that it is slang for smoking marijuana.