<P> As morning dawns, the friends reconcile, just as Isaac receives a message from Betsy that she is in labor . Rushing to the hospital, in Mr. Green's conveniently available car, the friends discover that it was a false alarm . Mr. Green is also revealed to be an angel, who has been helping the friends to earn his wings . Isaac shows his wife the video, who admits afterward that she is also scared about raising their daughter . The trio spend Christmas at Isaac's house, after which Chris has dinner with his mother and admits to his steroid use . Ethan goes to Diana's house, where he apologizes for how he acted and for not being ready to commit . Diana admits she missed Ethan and accepts his request to finally meet her parents . </P> <P> One year later, the friends and their loved ones spend Christmas together, and are revealed to be happy, and still friends . Isaac's baby cannot sleep, so the trio serenades her . It is shown that the story was all told from a book read by Santa, who is revealed to be the father of Mr. Green . </P> <Ul> <Li> Joseph Gordon - Levitt as Ethan Miller </Li> <Li> Seth Rogen as Isaac Greenberg </Li> <Li> Anthony Mackie as Chris Roberts </Li> <Li> Lizzy Caplan as Diana, Ethan's ex-girlfriend </Li> <Li> Jillian Bell as Betsy Greenberg, Isaac's wife </Li> <Li> Michael Shannon as Mr. Green </Li> <Li> Mindy Kaling as Sarah </Li> <Li> Lorraine Toussaint as Mrs. Roberts, Chris's mother </Li> <Li> Jason Mantzoukas as Bad Santa #1 </Li> <Li> Jason Jones as Bad Santa #2 </Li> <Li> Ilana Glazer as Rebecca Grinch </Li> <Li> Nathan Fielder as Joshua </Li> <Li> Tracy Morgan as the Narrator / Santa Claus </Li> <Li> Randall Park as Ethan's boss </Li> <Li> Heléne Yorke as Cindy </Li> <Li> Aaron Hill as Tommy Owens </Li> <Li> Baron Davis as himself </Li> <Li> James Franco as himself </Li> <Li> Miley Cyrus as herself </Li> </Ul> <Li> Joseph Gordon - Levitt as Ethan Miller </Li>

Who plays mr green in the night before
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