I think you're misunderstanding the point. He claimed to not know he was even in Dallas that day. The only reason it came out is because the records of him chec

I think you're misunderstanding the point. He claimed to not know he was even in Dallas that day. The only reason it came out is because the records of him checking out of the Dallas Sheraton were later tracked down. So the hotel he was at isn't the important part. The claiming to not know what city he was in at all is the issue. The example you gave of only remembering you were at work on 9/11 or in front of the TV when Challenger blew up proves the point. You remember exactly where you were. What you were doing isn't relevant. You knew where you were. And so did he, so why clam otherwise? If he had been in Detroit or Philly or something and made the same claim, it's less suspicious, but still a real hard story to swallow. The fact he was blocks away and then received the same message wired to him that J Edgar Hoover received declaring the President had died, well, there is no explaining that away.