Frankly, the idea of Johnny Ola sneaking into Michael and Kay's room is preposterous. "This is your room? How crazy is that?! I was looking for the toilet."

What about the possibility that little Anthony, whilst delivering the drawing, opened the drapes in order to better take in the delightful scene of a delightful day?

There's a big presumption that Cosa Nostra hitmen need the drapes open to whack a guy. Snipers need open drapes. Thugs spraying a room with machine guns can get by on a silhouette.

How the drapes got opened hardly matters, IMO.