Hard Times - S1-E3
Corrected entry: Aziraphale cites the only prophecy from Agnes Nutter that he could find as one for 1972, "do not buy Betamax" (a reference to the home video format war). Betamax was only launched in 1975 starting in Japan, so this advice should have been for then, not 1972. These prophecies were completely, even ludicrously accurate, so that excludes any explanation that she was simply a few years off, because she was never wrong. (00:19:10)
Correction: Nothing wrong with warning people in advance.
That's what prophecies are for, you say? True, for all of them. But if they come with a specific year and are infallible, then this one is a mistake.
Spiny Norman