I don't think it's fair of me to link you to the audio files they made (when they clear out the rest), but I can copy some stuff:

This for instance is from 3.04, when Jack hears the intercom for the second time. Just before Juiliette comes in to get Jack to operate on Colleen:

1. Speaker 1: (Everythings) under control (.5 sec)
2. Speaker 2:yeah? (2.35 sec)
3. Speaker 2: You know what he's doing to Colleen? (3.09 sec, note CC had "Karl" instead of Colleen)
4. (they don't know yet what is said here)(4.19 sec)
5. Speaker 1: the man knows what he's doing (5 sec)
6. Speaker 2 it was a mistake bringing those two here (7 sec)

Then some more in EMFH: Sawyer waking up on the operating table and the first intercom scene:

1. voice 1: No we shouldn’t do this (0 sec)
2. voice 2: just stay on okay/ just stay focused ( 1 sec)
3. Benry: And... (2 sec)
4. Benry: I'll check Goodwins house (3 sec)
5. unitelligable whisper (4.5)
6. Tom: where do I start, in the two days since the sky turned
purple, we’ve been blind our comms are all down and I can’t get
them up again and in case you forgot Colleen’s in critical (5.25)
7. Benry: Juliet’s taking care of her (16)
8. Sawyer: Ahhh, where am I? (19)
(20 sec right after sawyer says where am I there’s a weird noise,
could be his sighing but it sounds processed) I think this is just
him sighing.
9. Sawyer: what the hell are you doing to me? Let me up
10. Benry: Jason.
11. Sawyer: let me up
12. Jason: bite down on this please
13. Sawyer: you bite down on it
14. Ben: its for the pain.
15. Sawyer: Wait. Wait let me up. no.
14. Benry: God I hate needles.
16. Sawyer: No. No. What are you doing.
17 Sawyer: Wait
17. unintelligible whisper (56 sec possibly free 'em)
18. Sawyer: wait what are you doing,
19. what happened (1 min spoken quickly, possibly Sawyer screaming)

Then this is from Tale Of Two Cities, when we first hear the intercom:

1. has she tried to talk to him/shall we talk to him (3 sec)

2. Look on (4.5 sec)

3. Has he answered/his head is hurt (6 sec)

4. dont/won't talk (6.2 faint)

5. we're not sure if he knows that much/ we’re not sure if we’ll find out much (7 sec - 8.65 sec)

6. that's what I was thinking (8.5 sec)

7. (to) let him go free (9.8 sec)

8. it's not easy keeping something that secret/sacred (12 sec - 15 sec)

{Jack: If you're trying to talk to me, i can't hear you}

9. what are you gonna do/ go on and do it (14 sec, in background)

10. Let it go Jack (Christian's voice? 18 sec)

11. Now I can tell what you're doing (20.3 sec)

12. unintelligible (21.2 sec, possibly "Bring it back to her")

Some of these are not always really hidden, but some stuff is. So interesting. I can give you more if you want.