Yes, I had read that Scott had been an alcoholic, so while filming Patton his coworkers were told not to drink around him. And Brando had his own issues, sometimes it's best not to know too much about actors and their real lives because it can ruin the illusion they are trying to portray on screen. Speaking of Brando...Yes The Eagle Has Landed has not dated well but when I saw it in the 70s I thought it was okay. Patton was a much better movie obviously. Scott and Brando had reputations for being notoriously difficult on set and would drive producers, directors and actors crazy with their antics and self indulgence although I never heard anyone deny their talent. They also both had deeply troubled personal lives as well it seems.
I watched Last Tango in Paris yesterday, oof. It's definitely art house, the whole story was allegedly based on Bertolucci's fantasies. Ok, that might raise an eyebrow, but, adults can be complicated, and it's clear both lead characters were damaged people. Apparently the rape seen had been simulated, but the actress felt like she had been raped because the scene wasn't in the script. So it supposedly came as an unfortunate surprise. And Brando too had said there was a scene where he felt uncomfortable being in the nude, but that scene had been cut out.
Well, at least I can say I saw it, but much like Irreversible (2002) it's a movie I don't need to see again. Brando was good though, and I did enjoy seeing all those old Citroens. So there's that.