Bryce Dallas Howard's English accent
To me it sounded perfect. I thought she must be British but nope, she's american. Maybe British audiences would think she was putting it on but it fooled me.
Any Brits who've seen it want to chime in?
When I saw the movie she looked familiar at first sight, but it took me over an hour to realize who she was.
The accent was good enough to fool this American Anglophile.