At the hotel, Ethan finds and steals invitations to the Nutcracker Ball. Later, the friends meet at Isaac 's house before going out on their last Christmas Eve together. Prior to leaving, Isaac 's wife Betsy (Jillian Bell) gives him drugs to use during the evening, since he has been so supportive. The friends leave to follow their usual tradition, with the intention to go to the party afterward. Their first stop is the Rockefeller Tree. While at the Tree, Ethan reveals the tickets to the ball. Along the way, Chris, in an attempt to impress his teammates, purchases marijuana from their former high school dealer, Mr. Green (Michael Shannon). While making the purchase, Mr. Green shares the weed with Chris, calling it the present. While at a karaoke bar, the friends run into Diana (Lizzy Caplan), who recently broke up with Ethan for refusing to commit, and Diana 's friend Sarah (Mindy Kaling). The friends learn that Diana and Sarah will be at the Nutcracker Ball, as well. While at the bar, Isaac begins to be negatively affected by the drugs he took, resulting in making a video phone message admitting that he 's terrified of having a child. Chris also has his marijuana stolen by a supposed fan (Ilana Glazer) who is a Christmas - hating thief.
who played mr green in the night before
Michael Shannon