That actually was my reading of it. I've seen Smith before, maybe a dozen or so times, but if there was a basis for the mother gags, I missed it. Does he talk about his mom a lot on his show? I dunno - I just assumed Hader was taking the accent and dragging it into Psycho territory. I've actually been sort of waiting for them to do something along those lines with Romney/Patrick Bateman, so maybe I was predisposed to liking a skit like that.
And I didn't know that about Lohan and her lawyer (also, now I know who the 5th Romney son was - that was bugging me). Since they were lawyers, screening and not writing the skits, I wonder if it had something to do with her probation, and making sure she doesn't get into even more trouble.