'Riverdale' Cast Plays a Game of 'Trick or Treat' and Spills Co-Star Secrets! (Exclusive)

Only ET was on the set of 'Riverdale's first-ever Halloween episode and we asked six of your favorite stars to spill on-set secrets. Catch the new season of Sweetwater Secrets, ET's 'Riverdale' aftershow, is airing every Thursday at 1:30 p.m. EST / 10:30 a.m. PST on ET Live!