I saw this not to long ago and it's definitely an oddity. In the beginning they list 5 directors and then I think two more "special guest directors" and I thought uh-oh.
You hit the nail on the head with the tonal shifts. Yes, Sellers is pretty straight with it. Then I think there's a Niven scene where a stuffed bear is smoking a cigarette or something, some kind of Airplane-style sight gag.
I don't know if I was as enamored of the Mata Bond sequence but I'll have to look at it again.
Don't they break out the fembots at the end? I was thinking, oh, so this is the Bond movie that Austin Powers was parodying in that scene.
I was thinking it was too bad they didn't hire Brosnan to make this after he got fired from the main franchise, before Eon acquired the rights and made it with Daniel Craig. Same with the never realized "Warhead" script that also got reaquired by Eon (I think).
this film makes the biggest mistake a comedy can, it forgets to be funny. Maybe there were lots of "in" jokes that i missed but i dont think so.
And the Mata Bond sequence is as bad as the rest. I just like the actress.
Actually, theres another film that really features fembots, the second Bulldog drummond film, "Some girls do". Its in my Eurospy queue but im never managed the patience to try to watch it.