It’s a hat trick.  Warning: Spoilers ahead! Do not proceed unless you’ve watched all eight episodes of “Off Campus.”  Prime Video’s hockey romance “Off Campus” throws a curveball for those who know the show’s source material: Dean Di Laurentis (Stephen Kalyn) and Allie Hayes (Mika Abdalla) get their story unexpectedly thrown into Season 1.  Showrunner Louisa Levy exclusively told The Post that it felt “organic” to tell the story this way.  Allie (Mika Abdalla) in “Off Campus.” Liane Hentscher/Prime Logan (Antonio Cipriano), Dean (Stephen Thomas Kalyn), Tucker (Jalen Thomas Brooks) and Garrett (Belmont Cameli) in “Off Campus.” Courtesy of Prime “Allie is Hannah’s best friend, so that felt really easy,” she explained. “Also, [Allie and Dean’s] love story starts as a secret – so, what better way to surprise fans than launch it a little earlier than expected?”  “Off Campus” has already been renewed for a Season 2. The show is based on the book series of the same name by Elle Kennedy.…