David Jason had always wanted to work with Ronnie Barker before this series and Open All Hours (1976). He believed it profoundly affected the course of his life. He always considered him a mentor. He never understood why Barker left ITV for the BBC because he wasn't in the know. The two became close friends. He claimed Barker was very wise, and if he thought something was OK, that was good enough.
If you want the system to do something for us, give us more freedom, better grub, conjugal visits!
Mr Barrowclough: Conjugal visits?
Fletch: With our old lady, like, all above board, all ship-shape and Bristol Fashion.
Mr Barrowclough: I'm not aware of any prison that does that!
Fletch: Well, maybe not...
The closing credits listed the actors' names but not the corresponding names of the characters that they played.