zlo there are lots of those in many films, esp. pre-digital editing. Now of course it doesn't matter, because anything can be touched out, thus saving complex and difficult takes.
a truly classic blooper, pointed out to me by my dad, is in El Cid. When the Cid enters Valencia in triumph, as his army parades diagonally across the screen, once Chuck has passed, check in the top right hand quarter of the screen at the little alleyway perpendicular to the flow of the procession. You'll see a little old guy with a flat cap and raincoat watching the action for several minutes, looks like he's at a 1930s football match!
obv a nosey stage hand who got too near the action, but a huge complicated scene like that prob couldn't be reshot. Maybe the editors never even picked it up because you actually have to know he's there to spot him; but once you've seen the little guy, you can never forget him!
living where you do you've prob heard or seen the film "Pobeda" (Victory) dir by Yevgeni Matveyev (1985) Any chance you know where I might get hold of a copy? also in the same year, Idi i Smotri (Come and See) by Elem Klimov. Both films I've seen but are incredibly difficult to get hold of, i asked a Russian girl i know if she'd track em down if she went back home but i lost touch with her when she got divorced from me m8
help me out and Uncle Taw will make it worth your while!