During the myth 'Blown away' when Adam is going take the first shot, the narrator says: "The M4 is loaded with a 9MM hollow-point bullet". The gun show and which Adam shoots is an H&K MP5.
In the brown note 'experiment' they give Adam a cognitive test before he stands near the speakers and then give him the same test half way through and are surprised that he gets it right quicker the second time even though it's the same puzzle he's already solved once and therefore knows.