Dick Puts the Id in Cupid - S5-E11
Other mistake: While talking to his therapist, Dick tells her that one of the mishaps that he caused in his relationship with Mary was showing up to a fundraiser naked. While true, this doesn't happen until Episode 13 (Rutherford Beauty) - two episodes later. This was due to the fact that most of Season 5 was aired out of production order.
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Suggested correction: The show was produced in the right order, so this isn't a mistake. Being aired out of order isn't a mistake of the show. It should be noted that for each of the 6 season, episodes were constantly aired out of order.
