Sam is sitting on the couch watching the president on TV, he hits the mute button,

after Sam hits the mute button, he starts chuckling to himself and his daughter walks in. She asks him what's so funny and he says nothing. He then gets a phone call from Lambert who has another mission for him...

Yeah, his daughter is there the whole time, and I saw him laughing, then he hit the mute button...but it freezes before he gets a phone call...So there is another level? Or is that the last level with exception to X-Box Live levels (Are there any levels on Live yet?)

I had Nikoladze in a headlock and made him open the safe... then these guards came in. I waited for the blackout and ran my ass off to where I came in - ran up the ramps and back into the library. Then I went up the elevator. The room was pitch black cuz I had shot out the lights earlier. One dude was just standing in the hallway behind the elevator - I grabbed him and knocked him out. Looked around and saw another guard walking into a wall next to the elevator. I killed him too. Then I went down that hallway and back through the keycoded door - there's Nikoladze standing next to the clock facing the wall not moving or responding. I walked up to him and grabbed him. Then I knocked him out. Mission wasn't over so I put like 25 bullets into him. The first two killed him I'm sure, but it didn't say he died. Guess I gotta try again? Glitch? I hope I don't have to restore from an earlier save.

going back up the elevator. When you run your ass off up that ramp, there is now a new open door out of the library. You have to take that route