Well I was pretty certain that anybody who has seen Salvador Dali's surrealist experimental film "Un Chien Andalou" (1929) would have noticed this glaring mistake, but I didn't see it posted so I took the liberty of pointing it out. Now I realize that perhaps Dali's point in making this short film was a bit of a satirical mockery of the artistic film community of the 1920's, but clearly a line has to be drawn between intentional surrealism and being flat-out nonsensical. Continuity must be followed, even if the rest of the film isn't supposed to make any sense!
The slip-up takes place towards the beginning of the film, right after the jump-cuts between the woman in the bedroom and the man riding the bicycle. As she looks out the window, the man rides up to the curb and comes to a stop. A second later falls over, onto his SIDE, unconcscious, the bicycle landing on top of him. BUT! When the woman comes down the stairs to aid him, we see that he is clearly laying on his BACK. Not only that, but the wheel is still SPINNING! The bicycle was stopped as he fell over, how is the wheel spinning?? And if he was knocked out, how did he move onto his back??
Clearly Dali was more interested in ticking off the artistic word than paying attention to the common laws of phsyics and logic. I am sure that if confronted with this embarassing evidence, he would spout out excuses of how the film was intentionally absurd were he not long dead (and insane). But clearly, this was a slip-up, one of the worst of it's kind, and unfortunately it's sheer lack of professionalism ruined for me what was otherwise a fascinating venture into the world of surrealist experimental filmmaking.