[mcabbott]

At 2:39 it's saying that "doing good" and "doing well" are both correct, but mean different things: superman is doing good deeds, and scrooge is doing very well. But what to make of "I am good" isn't addressed (unless I missed it).

[cafard]

As in Tom Lehrer's song "The Old Dope Peddler", which ends "It's the old dope peddler/Doing well by doing good."

It's not something I heard years ago, but then one heard "I'm OK" and "I'm fine".