Buttercup's reaction when Westley rolls down the hill
Seemed weak. She reacts too quickly, and without any real surprise when he says "as you wish," and rolls herself down the cliff. She should at least pause and gasp, after all, "Dread Pirate Roberts" could have known Westley's phrase. Hoping this wasn't just an acting blunder, but Reiner should have reshot it or used another take.
Also, how is it that Buttercup had just been several inches from "dread pirate roberts" face while they were yelling at each other, but then she's describing Westley as "with eyes like the sea after a storm." A mask doesn't hide eyes. And of course, everything else about him is identical, like the mustache. But if she's had a suspicion it could be him, you sure couldn't see it.
And I do love the film, otherwise.
Pluto is the Peter Dinklage of planets.