At around 1:28 in Pulp Fiction, as Butch walks past this random house on his way to get the gold watch back from his apartment, a radio can be heard in the background. The only part of the broadcast I can make out is "This is the Jackrabbit Slim's..."
This seems potentially significant since, chronologically speaking, Mia and Vincent did visit Jackrabbit Slim's before these scenes with Butch. But nobody died or overdosed on heroin or did anything else illegal at that diner that I can recall, so I don't know why its name would come up on the radio. Do we know what the rest of the broadcast said, or what off-screen incident it could be referring to?