Other mistake: Logan, Charles, Erik and Hank are boarding the plane after breaking Erik out of the Pentagon. Erik goes to reach down for the paper and Logan stops him by placing his bone claws down on the paper. On the third column of the article on the front page, the article mentions a shoemaker named Max Schwartz and a couple of paragraphs below, a woman named Mrs. Locklan Smith. On the fourth column of the article, the exact same paragraphs of both the shoemaker Max Schwartz and Mrs. Locklan Smith have been repeated a second time. (00:52:20)
Other mistake: During the final battle of the theatrical cut, in the future sequences, in at least one shot, you can see in one of the reflective surfaces of the room where Logan is being "sent back" that Rogue is the one controlling him and not Kitty. This is a remnant of a deleted sequence where Rogue is brought in to absorb and use Kitty's power after she was injured. The scene was cut from the theatrical release and the film was re-edited so that Rogue wouldn't appear in the future and Kitty is the only one "sending" Logan, but at least one shot where she's visible in a reflective surface was left in as an "easter egg" for fans. Still, it is technically a mistake in the theatrical edition. (The Rogue version of the scenes were included subsequently in the extended "Rogue Cut" of the film, and in the special features, this intentional mistake in the theatrical edition was confirmed by producers).
Chosen answer: Government agents were previously aware of mutants - they are probably the same ones that imprisoned Magneto, and his attempt to prevent JFK's assassination was most likely covered up due to the revelation that Kennedy was a mutant. Magneto was already in prison by the time Trask pitched his Sentinel idea to the government, which is probably why the program wasn't instituted.
Phaneron ★