I’m fairly certain this was put on because you can tell towards the end he is trying to stifle a grin.
No, I seriously doubt he was putting it on, he was definitely slurring and such, sure people can fake that, but I think he was on some kind of serious downers.
I think so too. After all, he is an actor. Acting like he did on Letterman would not be a stretch.
Also, I read somewhere that his brother-in-law, Casey Affleck, was there filming all of this. I think they are up to something.