Anna Madeley has played two different characters over the course of the series:
- Episode 21.2 Moment of Surrender: Part 2 (2018) - Anna Lawson
- Episode 21.1 Moment of Surrender: Part 1 (2018) - Anna Lawson
- Episode 16.2 Change: Part 2 (2013) - Annette Kelly
- Episode 16.1 Change: Part 1 (2013) - Annette Kelly
Kelly Hunter has played two different characters over the course of the series:
- Episode 21.2 Moment of Surrender: Part 2 (2018) - Gwen Blair
- Episode 21.1 Moment of Surrender: Part 1 (2018) - Gwen Blair
- Episode 1.2 Buried Lies: Part 2 (1996) - Ronnie Crew
- Episode 1.1 Buried Lies: Part 1 (1996) - Ronnie Crew
The motorcycle jacket worn by David Cannon is almost identical to the worn by Dr Gregory House.