It’s not so much a wink as a recurring motif: the 7, the magic number par excellence, comes up regularly in Shazam! There are indeed the Seven Sorcerers of the Rock of Eternity, as well as the Seven Deadly Sins. But we note that Billy’s mother resides in apartment 707, and that the metro that takes him to his powers belongs to the company SEPTA. A way to make us understand that he was predestined for magic?