Character mistake: Both Jeremy Clarkson and his guest Sir Michael Parkinson identify "The Four Yorkshiremen" sketch - about four Yorkshiremen trying to outdo each other with their complaints about life - as a Monty Python sketch. It isn't. It is from "At Last The 1948 Show", presented by David Frost, and was first performed by Tim Brooke-Taylor, John Cleese, Graham Chapman and Marty Feldman, although Monty Python have often performed it.
Joey and the High School Friend - S2-E11
Character mistake: Michael and Jimmy appears to have behavioral similarities. Joey therefore asks Gina when she slept with Jimmy, implying that he might be the father. Gina answers "22 years ago." Joey then asks how old Michael is, and Gina answers "22 years and 9 months." What? So he was born 9 months before the conception? Shouldn't he be 21 years and 3 months? (00:11:40 - 00:12:20)