This brief clip, taken before the filming of East of Eden, shows James Dean (who would get the role of Cal Trask) horsing around with Paul Newman (who would lose the role of Cal's brother, Aron, to Richard Davalos).
It's an amusing enough clip just on its own, with the two future superstars goofing for the camera, but it's also inadvertantly revealing, not only for the pulsating homosexual vibe coming out of Dean, but for the illuminating moment when the casting director tells Dean and Newman to "switch places" — as indeed they would, with Newman getting a lot of roles that, if it weren't for his death, likely would have gone to Dean.