I thought the same thing but I cant figure out how a camera operator in the white house doing a shot of a former presidents casket would not be given an allowance to change the angle to be what it needed to be. To get the "right" shot.  That's what is interesting to me. This is a former president and this is the U.S. government, yes we joke how incompetent they are but when it comes to making former presidents look like Angel's, they do a great job. So WHY this angle!? Worst case they couldve done a small post shot editing and simply flipped the scene on its horizontal so it looked normal without doing any physical labor or physical changes. We have all these options to get the shot right. SO WHY IS THE FLAG POSITIONED THIS WAY....? unless, its because it truly is showing the world we are in distress?