Thank you to all who contributed with their answers! :)
I'm researching as much as I can on the Internet in order to find titles that used a technique, or "broke a rule" first ever (or at least close to that).
I'm writing my thesis on breaking the rules in graphic design, and I'm also doing a few pages on photography and film (as I see them connected). I'm not educated in film history, but I'd like to have my data right, and not miss some important elements. So, I'll just ask a few bonus questions, just in case someone here knows the answers, and takes the time to answer them. (I'm not asking anyone to do the research for me B))
Regarding the lens flares, I've seen stills from a black&white, 1958. movie (I Soliti ignoti) that has them... But I'm far from knowing which movie was the first to use them... Can we at least say that in Hollywood, the first one was Easy Rider, 1969.? (source: Vissions of Light documentary). Did maybe Kubrick have them in the 50's?
The 180 degrees rule, I suppose it was broken a few times before Kar Wai Wong came along.. The western DJ Kast mentions probably is older.. Does anyone know a more older example? Hollywood/non-Hollywod, doesn't matter..
Splattering the camera... (with blood, water, whatever) When did that start to happen? The only thing I read was about John Toll (Braveheart cinematographer) having sea water splashing the lens of the camera in the movie Wind. Seeing how this was 1992., I suppose there's tons of earlier examples..?
Showing frames simultaneously on the screen; a movie called Time Code did this in 2000., with four frames. Any other examples of this technique?
Eisenstein, I suppose, did a revolution by focusing on the montage... In which segments did Citizen Cane make a revolution in filmmaking (other than deep focus)?
I guess that would be all for now.. I hope I'm not bugging too much. :unsure: