Michael says he is impersonating Kevin Nealon as Arnold Schwarzenegger
Michael leaves with "I'll be back"
Michael says "Houston, we have a problem"
Dwight says that the office needs someone like Jack Bauer
At the end of the episode, Jim finds an encouraging note from Pam, and returns to the office to ask her out. This mirrors the end of the finale of the original series, where Dawn returns after finding an ecouraging note from Tim.
Michael leaves the office with this closing