Murray Gold (composer) and Ben Foster (conductor) appear respectively as a pianist and a guitarist in the band in the ballroom scene.
This was Kylie Minogue's first major acting appearance since her diagnosis and recovery from breast cancer two years earlier.
The first appearance of Wilfred Mott.
On the second day of shooting, David Tennant learned that his mother, Helen McDonald, was on the verge of losing her five-year battle with cancer. Tennant immediately left Upper Boat to be present during his mother's final moments. The led to the shooting schedule being re-arranged to focus on scenes that didn't feature the Doctor and special effects work. The production was then suspended until Tennant was able to return, a stressful situation given Kylie Minogue's short window of availability.
The Doctor states that he is 903 years old.