The artwork behind the titles was drawn by "Tony Hart". It consisted of still cartoons of the three characters in situations from that week's episode.
The only piece of dialogue I remember was from one episode in which the Boss (Paul Whitsun-Jones) was showing his inept colleagues the plan of a target premises and, in wishing privacy, said to one of them: "Fingers, the blind." However, I do not see a character named Fingers in the extensive cast list referred to here.