By David Fear When Adam Scott first started filming Severance, the Apple TV show that turned into a cultural phenomenon, the actor knew he was part of something special. The actor had been around long enough to recognize that it played off his persona in work-place sitcoms like Party Down and Parks & Recreation, but weird and cryptic enough (what are they doing with those numbers? What’s up with the goats?) to feel unique. What Scott and his costars hadn’t quite counted on was the passionate response the show engendered among viewers, especially when it came to that Season 2 finale. When asked if he personally gets blowback from fans over his character Mark Scout’s decision at the episode’s climax — we won’t spoil it for you if you haven’t caught up yet — he admitted that people do bring it up: “You mean, ‘Why did you — why did he — do that?’ Yeah, yeah.” But during Scott’s stop at the Rolling Stone Studio Live at SXSW podcast, he admitted that he doesn’t mind folks being deeply invested in what happened.…