IIRC there were quite a few celebrity cameos in the film.
The movie was based on a book by Terry Southern written in the late 50s. But in the book, Guy Grand was an American and it was set in the US. Terry Southern did the screenplay and it does follow the book otherwise. The movie was panned as being disjointed, but that's the way the book was too, a series of scenes instead of some grand (pardon the pun) plot.
If you don't know Terry Southern, he wrote or co-wrote some famous screenplays including co-writing Dr. Strangelove.