I haven't seen this, but being an HBO production, my guess is that the F-word pops up pretty frequently. Only reason why I can think this is TVMA.
"I did absolutely nothing today and it was everything I ever dreamed it would be."
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I think it's TVMA because it was never released on the big screen, hence did not need an MPAA rating.
As for why it got the TV rating it got, it's got a lot of 'clubhouse talk.' F-bombs, sexual references, etc.
I usually wouldn't want to see a movie with content like this, but I could appreciate the context, and the painstaking historical intricacy included from Billy Crystal. Watching the featurette on the DVD really gives you an appreciation for the effort it takes to include such detail and accuracy.
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Lol, go get that fat ****. I love that line. Its also a little suggestive. It would get an R-rating if in theatres.
enjoy life
PLOW DOWN ALL THOSE FRIGGIN' TERRORISTS!
The Dude Abides...