Samsung 850 Question??

[Sammy850LCD]

Hey guys have a samsung 850 and so far absolutely love it..the tv was isf calibrated not to long ago. I have been noticing (before and after calibration) that during a dark scene when most of the scene is black i get light gray or dull white spots all over the screen. They arent little dots but almost larger dull spots all around mostly in the corners going to the middle. I noticed it alot when watchin Dark Knight especially at the end and during the credits...it this normal or is something up?
During all other scenes picture is great.

Thanks!!