I've watched a couple of documentaries and they all show the same thing, Goering being very shocked when forced to watch film of Allied entrance into holocaust camps. Bodies, disease, etc. Was he faking it? It makes no sense because he was a pretty hardcore racist himself.
(I'm not an anti-Semite by the way and certainly not trying to defend the man, just curious why he showed surprise at being shown the camps)
Besides Himmler the top Nazis had very little to do with the actual running of the administrative side of the concentration camps or even the holocaust in general. As such it wouldn't be surprising if this was Goering's actual first look into what was actually happening in the concentration camps.
Furthermore top Nazis could be quite squeamish, for example when Himmler went to observe a shooting of Jews in occupied Russia he had a near nervous breakdown from what he saw:
Himmler became very uncomfortable, very quickly. As the firing squad started, Himmler, was even more nervous. During every volley he looked to the ground. When two women could not die, Himmler yelled to the police sergeant not to torture them
Goering actually had quite an interesting history with concentration camps, he opening the first one, Dachua in 1933, and he (along with Himmler) was responsible for ordering Reinhard Heydriech to organize the "final solution" to the Jewish question in Europe.
After the failures of his Luftwaffe, Goering kinda took a backseat in politics, he was still active but the administrative aspects of things like the holocaust and the concentration camps would have been handed over completely to Himmler. This happened right around 1942 which is when the liquidation of ghettoes and mass gassings in camps began to happen.
Of course, it's also possible that Goering was lying to make himself seem more innocent or ignorant of the concentration camps; but I would point out that at Nuremburg Goering bragged about setting up the concentration camps, so I do think there was a genuine shock factor at seeing the footage.
I would also like to second requests for a link, because I've never noticed this in documentaries on Nuremberg and would be interested in seeing something discussing Goering's reaction.
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Do you have a link to a video showing his reaction?
I take it from the question, that this was an event that was part of the trial itself - specifically that he was in the trial, and this was evidence being presented to justify conviction. Is there any historical evidence to point to this simply being a reaction of a person realizing that there was damning evidence that would lead to his conviction and, thus, execution?
Goering was chief of the air force, the Luftwaffe. He may not have known about the details of what happened in the camps. In addition, there's a big difference between knowing about something and seeing it with your own eyes.