Photo Illustration by Erin O'Flynn/The Daily Beast/FX and Getty ImagesIf you thought The Bear was only going to fill you up with juicy Italian beef subs, just wait until your mind gets overstuffed with the absurd number of cameos. In its hour-long sixth episode, the second season of the FX on Hulu series flashes back to Christmas a few years before the show actually takes place—and we learn that the Berzattos happen to have an incredible number of A-List stars in their family tree.(Warning: Spoi