Hey there!
Please, someone, get them out of there! There’s a good reason for this: the family in the shot isn’t reacting to the man dangling from the roof; they must have been completely unaware that anyone was there. He appears to be dropping carelessly from the sky, but where did he come from?
Some people believe it was just a gimmick or a problem with the film’s movement. Others, though, believe it is a snapshot of the previous owner announcing their arrival.