When Wayne Knight is stealing the embryos, you see him throw the top of the secret container/shaving cream on the floor. Then, after he has all the embryos, he picks it up off of a table where it was neatly placed.
There must be different versions of the movie. In my copy, he places the
top of the can behind him to his right, collects the samples, then picks
up the top from where he put it.
The liquid nitrogen would not have been a problem, you can literally drink that stuff and it just boils off. Its very unlikely that they would have been frozen in liquid nitrogen as it not only has to be replaced but constantly cooled and offers no real benefit over a simple refrigeration element. However, grabbing glass tubes with frozen contents would mean they would freeze to your fingers, ouch!
All right. When Nedry enters the embryo storage area he places the can lid behind him to the right, right? He doesn't throw but sets it down on a table. After filling the can with all the embryos the camera angle does a 180 turn so it is by the door he came in through. Now we can see in fact there really was a table behind him but he was blocking it which made him look like he through the can on the ground.
Nope, he doesn't throw it on the ground. He takes the lid off, turns around and places it on a table(which is out of screen-shot), and after he is done picks it back up off the table.
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