This is the last episode with Gavin Richards playing captain Alberto Bertorelli. In the next season this character is played by Roger Kitter. This is also the last episode with Derek Royle playing Ernest Leclerc because he died on 23 January 1990, between the end of the sixth and the start of the seventh season. Royle was brought in the series as a replacement for Jack Haig (who played Roger Leclerc), who died between the end of the fifth and the start of the sixth season.