Francis says "Hurts, don't it?" during one of the fight scenes, recalling Wade Garrett''s famous but often misremembered line (which is actually "That hurts, doesn't it?").
The wedding reception at the beginning of the film is for a couple named Mike and Phoebe. Mike and Phoebe were the main characters from American Ultra (2015), another film written by Max Landis that features the Ultra program.