Emily Dickinson wrote over 1,800 poems. Only seven were published in her lifetime, all anonymously and without her consent. (source)

Shakespeare makes Lear, an early Anglo-Saxon King, speak of not wanting spectacles. In relating Macbeth's death, in 1054, and King John's reign in 1200, he mentions cannons. In Julius Caesar, he makes the clock strike three. However, these three inventions were not invented until the fourteenth century. (source)

In the 1980s in the United Kingdom, a television commercial advertising the Yellow Pages ran, depicting a man looking for the (fictitious) book Fly Fishing by J. R. Hartley. At the end of the ad, the man speaks into the phone, "My name? J. R. Hartley," which became a popular catchphrase in Great Britain. In the 1990s, a man wrote a book entitled Fly Fishing, and used the pseudonym J. R. Hartley to cash in on the ad's popularity. The book, though out-of-print, is still quite popular, but mostly due to the commercial, not the book's content. (source)