Russell T. Davies was so impressed by David Tennant's performance as Casanova that he cast him as the Tenth Doctor in Doctor Who (2005).
Red Productions filmed on location overseas in a stately home in Dubrovnik, and alongside production of Casanova (2005) in Venice. The two production teams shared resources and were given the unofficial names of "Little Casanova" and "Big Casanova" respectively.
Russell T. Davies' association when London Weekend Television producers Julie Gardner, Michele Buck, and Damien Timmer approached him to write a 21st-century adaptation of Casanova's memoirs. He accepted to script the series because it was "the best subject in the world" and, after reading the memoirs, sought to create a realistic depiction of Casanova instead of further perpetuating the stereotype of a hypersexual lover.
The series was filmed alongside the first few episodes of Doctor Who (2005), which meant producers common to both projects, including Russell T. Davies and Gardner, made daily journeys between the former's production in Lancashire and Cheshire and the latter's production in Cardiff.