The revelation that the movie is unfolding inside the janitor's mind becomes more explicit by the end. Early in the film, while driving to his parents' house, Jake describes watching the "kids" practice and perform the musical Oklahoma!, though he doesn't specify which kids he's talking about. Immediately after that, we cut again to the janitor, watching high school students rehearsing the show. Later on, when the girlfriend has followed Jake into the supposedly abandoned high school, she runs into the janitor. After they chat, we see a rendition of the "Dream Ballet" sequence from Oklahoma!, but the actors are instead dressed as Jake, the girlfriend, and the janitor.
When the ballet ends, Jake and his girlfriend are gone, and the janitor's left all alone. He changes out of his uniform and back into his clothes, trudges to his pickup truck in the snowy school parking lot, and promptly starts freaking out. All the while, scenes related to the events of Jake and his girlfriend's story play out, seemingly in his mind. He strips naked, then follows the ghost of a dead, maggot-ridden pig back into the school. That's a clear reference to a moment earlier in the film, when Jake tells his girlfriend about how his father had to kill maggot-ridden pigs on the farm many years earlier. After the janitor follows the ghost pig, that's the last we see of him. The film hard-cuts to Jake — wearing high school theater production-level old man makeup — accepting a Nobel Prize, and then singing the song "Lonely Room" from Oklahoma!
