It was actually Tommy himself who was supposed to be a vampire, which somehow implied flying cars in his mind
Cutting that part out is cinema's greatest mistake. I don't even think they did it because it was too stupid (i mean, Tommy had authoritarian control over the film anyway) but because they ran out of money lol
Ps if you enjoyed the room you should watch the Tommy Wiseau interviews on YouTube, they're amazing. There's one where they ask him if he thought the Room would be this popular and he goes 'I did naaht!' in unintentional mimicry of the film