An alternative title might be How much of this was staged, and who was in the know? Just the conclusion, you suspect, and just that central couple. That means that, as so often was the case back then, as is almost always, complicatedly but most certainlyly the case now, this is fiction and fact both. The film concludes with an innocently saucy coda. Before that there’s lots of great-looking just-pre-car footage. Also, people just get all awkward around these first cameras.