Colson, you’re quite possibly right. I say this because the 3D version of Jurassic Park has a few additional frames of the T-Rex roaring inside the visitor’s centre. You can find this by comparing the number of frames in the 2D Blu-ray/DVD/Laserdisc/VHS to the 3D BD. It’s just 2 frames more at the fag end of the shot, but it’s definitely there. The older versions, including the film print, didn’t have these extra frames due to human error or other reasons. Look below -

http://imgur.com/a/dPX5L