Joan Fontaine is far too beautiful for this role.
Joan Fontaine is beautiful, and every time I watch this movie it irks me that no one acknowledges this. And I know that's silly, since she's *supposed* to be plain and mousy. But all this talk of the beautiful Rebecca and I just want to shout to the screen, "Idiots, look at the woman standing right in front of you!"
But while they had a hard time making Fontaine look plain, I think she did a fantastic job of making the 2nd Mrs. DeWinter timid, awkward and painfully self-aware.
...rolling downhill like a snowball headed for hell...