Frost was a chain smoker in the novels. In his 2013 autobiography "My Life" David Jason revealed they decided to make Frost a non-smoker in the television series as he had recently quit smoking cigarettes in real life.
Novellist R.D. Wingfield, whose "Frost" book were the inspiration for the series, was very critical of the TV adaptation and said that it had ruined the character of Jack Frost that he had created in his novels.
Between takes, the cast (particularly David Jason) and crew were forever playing pranks on John Lyons (DS George Toolan). They devised fake scripts which Lyons had to learn at short notice, involving ludicrous situations for Toolan: on one occasion, they made his character wear a neck brace; on another, they made him ferret around in a smelly rubbish bin looking for evidence. Each time, Lyons said "You won't catch me out like that again" but he always fell for the next prank.
Two of the regular stars in this series are actors who have changed their names from White for professional reasons. Inspector Frost is played by David Jason (real name David John White) and his on/off girlfriend Shirley Fisher is played by Lindy Whiteford (real name Lindy White).