There’s a heartbreaking scene in Bradley Cooper’s “Maestro,” about the marriage of the composer and conductor Leonard Bernstein (Cooper) to the actress Felicia Montealegre (Carey Mulligan), in which, as the couple argue in the bedroom of their Upper West Side apartment, Macy’s parade inflatables glide past the windows. A giant Snoopy echoes a Snoopy we saw in a family scene; it also gestures at the awkward gulf between Bernstein’s private and public lives, as if the musician himself were yet another helium-propelled icon from the Thanksgiving pantheon.
