There are about five or six windows in the room when John gets locked up in the studio, but the noise only breaks one.
John told Rachel that sharks are not native to the water there. Actually, the Puget Sound is home to sixgill sharks.
The infrasound clip in question may very well not have been recorded in the literal sense: source > microphone > filters > recording device. Tone synthesis has been featured for a long time in many (if not all) audio editing and creation software suites, not to mention the multitude of hardware synthesizers available. For simple, pure tone generation at known frequencies this is actually the method of choice. Synthesized audio would contain no extra information about the source (there isn't an actual source) that could be somehow forensically revealed and interpreted.
Rachel: I bet you impress all the girls with mops and safety pins.
John: No, just you.
Rachel: You're very odd – you know that?
Frank: (to John, Rachel, and Stella) Uh, you three ought to start your own club, get your own personalized pocket protectors.
Frank: (seeing a corpse strangled with piano wire) Moved right to the top of my list of "had to hurl."
Rachel: Are you hooked up to a mainframe somewhere?
John: That remains to be seen.
John: My dating advice?
Frank: Call Ann Landers.
John: She's dead.
Frank: She is?
Frank: Damn. I liked Ann Landers
Frank: (watching an autopsy) I've been working here way too long, because that didn't even make me want to puke.
Digger: Evening, pretty lady. Get you something to wet your whistle?
Rachel: Actually, I was looking for John Doe, but I guess I just found him.
Digger: You know John?
Rachel: He saved my life. Or I should say I saved his life, then he saved mine.
Digger: Uh-huh. You must be Rachel, the doc from the airplane.
Rachel: What, he's mentioned me?
Digger: Mentioned? Just about burned a hole in my ears.
John: Frank, all I'm asking for is five minutes. I need some dating advice.
Frank: You might want to check a more current source. Last time I went on a date was the opening night of Dances With Wolves. I had on M.C. Hammer pants and a gold earring.
John: Hammer dropped the "M.C." in 1991.
Sprague Grayden is credited but doesn't appear in this episode.
When John is referring to the IP address of the chat room, he uses an address of the form 127.x.x.x which cannot possibly be true since all addresses of that form refer to the local computer. (If you went to 127.56.78.05 or whatever, you would actually be going to your own computer.) The reason for this is the same as the whole 555-xxxx thing for phone numbers, as a measure of production necessity.