No spoilers, but we will reveal whether or not “Werewolf by Night” has a post-credits scene, so if you don’t want to know, turn back now!See above. It’s basically a Marvel Studios Halloween special, directed by the insidiously talented Michael Giacchino, who has contributed the musical scores to some of the MCU’s biggest films (“Doctor Strange,” all three Tom Holland “Spider-Man” movies, “Thor: Love and Thunder”). Presented in black-and-white, with theatrical flourishes like “cigarette burns,” “Werewolf by Night” is meant to mimic the look and feel of classic Universal monster movies from the 1940’s.