This episode is dedicated to John Coleman, a prop manager who fell from a cliff and died during a break in filming.
The cast was not available for a long enough time in 2006 for an entire series to be filmed, so a 2-hour special was made instead.
Tristan Sturrock, who plays Danny, the Doc (Martin Clunes)'s rival for Louisa (Caroline Catz)'s affections, also appeared all three of the other productions featuring "Doc Martin" (Saving Grace (2000), Doc Martin (2001) & Doc Martin and the Legend of the Cloutie (2003)) as "Harvey".
After PC Mylow provides his sperm sample and is about to drive it to the clinic, Mrs. Tischell comes to talk to him. There is a bush behind them that is clearly a phallic symbol an inside joke about the sperm sample.