Mr. Monk Visits a Farm - S5-E14
Character mistake: When Randy Disher is having Chinese food in his apartment with his new girlfriend in 3-12 "Mr. Monk Gets Cabin Fever", he gets a fortune stating that he is going to get money from his uncle, and says that he doesn't have an uncle. In this episode Randy inherits a farm from his uncle who appears to have committed suicide, but was actually murdered.
Suggested correction: Randy says when that uncle dies that they were never close, so his leaving him the farm comes as a total surprise. It's still a character mistake, however, Randy is established as the sort of person who could "blank out" a relative that long-lost.
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.