- Author Existence Failure - Series creator and head writer Ian Mackintosh vanished in a small airplane flight near Alaska, while series three was being shot. Three poorly regarded episodes were written to fill out the series, but the producers decided to end the show rather than turn it into a Franchise Zombie.
- Technology Marches On: Unavoidable from a series produced in the 70s in which, for example, mobile phones and computers didn't exist. Some of the plots that are kickstarted by not being able to contact an agent abroad just wouldn't work today.
Trivia / The Sandbaggers