Have You Ever Seen Two Room Numbers on the Same Hotel Door?

It absolutely baffles me when I look at this photo now. Why in the world would there be 2 room numbers on the same room door in Holiday Inn? My family of four was staying in the same room and not in two different rooms as the kids were small. I can only imagine that this door opened into to a private walkway or corridor leading to two seperate rooms 707 and 709.