(Read more: Buffett speaks out against DC's 'extreme idiocy')
Buffett added, "It's the best written, best acted thing I've ever seen."
Right before the record-breaking finale, he sent out a Twitter homage to "Heisenberg," the alias for the show's meth-kingpin Walter White, portrayed by Bryan Cranston.
Buffett admitted that he had someone on his behalf send out the tweet to his 650,000-plus followers. It's only his third tweet since he signed up on Twitter in May.
He won't say whether the photo was "photoshopped," saying the image speaks for itself.
"That's my hat though," he quipped.
—By CNBC's Matthew J. Belvedere. Follow him on Twitter @Matt_SquawkCNBC.