- Gregg Beams laugh in the plane sequence, when talking to Greene.
That's just Greene's character. He's this unlikeable guy who laughs at his own jokes and thinks greatly of his own importance.
- When Greene does the sinister smile to Leiter and Beam from his car window, and they're just looking at him thinking. "WTF
"
That's just Roman Polanski. Or at least, Amalric playing Polanski.
- Elvis' smile to the guard in the Opera, it's totally random.
Again, I see it as a little characterisation. Anatole Taubman described Elvis as "thinking he's all that when he's really just clumsy and materialistic" (not a direct quote). It's just Elvis being Elvis.
- M's running a bath and applying face cream.

I actually liked that scene; the juxtaposition of M interrogating Bond over his activities and then issues orders agaisnt himin contrast to something so ordinary and feminine as putting on her makeup.
- When M smashes the ashtray and rambles on about Florists. 
The line about florists was one of the best in the film!
"When someone says 'We have people everywhere, you expect it to be hyperbole. Florists say it all the time!" just goes to show how complacent MI6 had gotten. The smashing of the ashtray highlighted the fact that despite being her bodyguard, M never really knew Mitchell.