Digging around a thrift shop, I found a copy of the original "Chitty Chitty Bang Bang" story that the movie was based off of and knowing how books become movies that may be something entirely different, had to take it home to read of course! As expected, the faint resemblances between the story and the movie must have had its fans up in arms when the show came out.
Had to roll my eyes at the predictable removal of the mother of the family, Mimsie Pott, poor dear was killed off in favor of the widower-romance thing apparently. Truly seems to be an invention, though he did invent the toot-sweets and successfully sell them to Lord Scrumptious. Also noted that Caractacus has been split into two people in the show with the invention of his father to cover his Naval Commander part... I'm halfway through the book and most of it has been discovering and blowing up a hidden arsenal of weapons a bank robber was keeping in a cave. Don't remember that in the movie! Would have been good.
Aside from all that, I rather like Chitty herself, cheeky thing flashing "Push, Idiot!" at them when they aren't quick enough to hit an unknown lever (and thus discover her wings) - she merely wanted out of a traffic jam, who wouldn't?