I like the Notes feature, although too fast at times for no reason.
I have found two mistakes. One was grammatical. I don't remember the episode, but it said "an liar."
The other was a biggie. In "The Letter", they said Phil Rizzuto was a long-time Mets(?!?!) announcer. They also said Tom Seaver was a Mets announcer. He is now, but he used to be a Yankees announcer (at least until 1989 when I lived in NY). So I'd imagine he was still doing Yankees games then.
I'm surprised they didn't mention the stock footage of the Yankees game was full of errors. The pitcher changed from #21 (Scott Sanderson, if memory serves) to #41. Pat Kelly (#14) can be seen playing third base where Charlie Hayes should have been.