Don't worry - John Travolta made it on to the below list. Apparently he was Quentin Tarantino's first choice for Vincent (after Michael Madsen, who Quentin wrote the roll for).  Failing that, we could had Gary Oldman or Andy Garcia in the role, which would've made it an entirely different film...

Johnny Depp was his back up if Tim Roth wasn't able to play 'Pumpkin', while he got his first choices Amanda Plummer (to take on the role of Honey Bunny) and Patricia Arquette (Jody).

There's no mention of who was in the running to play Mia, but one can only assume he had an entire page with the name "UMA THURMAN repeated over", and over again...

  

Via Imgur