Jansen: (trying to find Marty) He's not in the phone book.
Jeff: No, he wouldn't be. Try the register of deaths.

(After Jean says she might get a marriage proposal)
Marty: Jeff, you've got to tell her.
Jeff: Tell her about what?
Marty: Tell her about me! It's bigamy!

Marty: Jeff, no matter what Jeannie says, I think you should stay the night.
Jeff: What?
Marty: Of course, I don't approve.

The final scene is supposed to take place at 5 minutes past midnight, but the closing shot of the ocean clearly shows the sun out.

Policeman in car: Word's out that this is an anniversary trip. In three or four days' time, he completes his first year inside.

This is said in the pre-title sequence; however, throughout the episode this fact keeps slipping in and out of people's minds. During parts of the episode the police clearly reference this when protecting Jean; at other times, no one (including Marty) seems to know what Jansen is up to.

Marty: It was Hobson's choice: either he jumped the cliff, or he went to jail.

"Hobson's choice" is defined as a "choice" that is really no choice at all. The phrase is said to have been named after a British stable manager named Thomas Hobson, who offered guests the horse nearest the stable door or no horse.