Late to the party so sorry if it's been said before but the Bruce Lee scene in ONCE UPON A TIME IN HOLLYWOOD is shot as a one take until the very moment Cliff throws Lee into the car. Plus, the set suddenly becomes empty for no reason. It could suggest unreliable recollection or
perhaps the fact that the scene suddenly becomes a fantasy, an imagined outcome to this encounter. Why would everyone but one extra disappear from the scene after the one take ends? That makes no sense story-wise, so the reason must be something else. Maybe Cliff convinced... 
himself that he "beat" Bruce Lee and the images going through his mind reflect this fictionality. It's like the set becomes a hyper-set, the stage for a new play within the film, a form of meta-narrative signifier. 🤔
That last lingering extra... I suspect Tarantino might have kept this person on screen to justify Zoe Bell's apparition (they're seen on the phone, probably calling her). And Bell literally seems like she is summoned magically, appearing suddenly in the 3rd shot below.
