That Lionel Jeffries narrates the audio book (published in 1982) is curious given that his character in the film, Grandpa Potts, doesn't appear in Fleming's story. Indeed, if Roald Dahl, who wrote the screenplay, had stuck more closely to his first draft, then Lionel Jeffries might not have appeared in the film at all; Roald Dahl wrote the character of Grandpa into the second draft.
As for the image on the inlay card, the illustration doesn't precisely copy the film car (designed by Ken Adam), but the essential traits or memes of that car are there: the passenger section that re-uses a wooden boat, the long silver cylindrical (or slightly cone-shaped) bonnet secured with a leather strap, the gold-rimmed radiator grille and gold headlamps, and the red-and-yellow-striped wings. The Potts family (actually, the Pott family in the book) in the car looks towards the viewer in a similar arrangement to that shown on the film posters and other publicity material, the only difference being that the family on the inlay card isn't waving. In other respects, however, the families are identical, even down to the clothes.
|Covers from the audio book (left) and the 1968 novelisation|
|Chitty as shown in Collins' Beginner Books edition|
|Chitty in the 2002 Galaxy edition|
|Chitty,Yearling edition (2005)|