IIRC, it was something like, "Later, a**hole!" (bleeped, of course) The note in Jim's briefcase was from Pam--it was one of the yogurt lid gold medals from the Olympics they held (season 2, I think) and and a note that said, "Don't forget us when you're famous!" He kept looking back at it during the interview, like almost being distracted by it (but in a good way!) As far as I could tell, he left Karen in NY--she'd left the office before Jim's interview to go meet friends for lunch, and there was a shot of Jim driving alone afterward, obviously thinking about everything. I think it was during a voiceover of Pam's, talking about how maybe she and Jim were just too similar to be together. At some point, there was also a scene from the beach episode that wasn't shown last week; it was after Pam gave her speech and was down by the water, soaking her feet. Jim came down to see how she was doing, and he said that the reason he'd gone to Stamford was so he would be "not here," and that he kind of felt like he'd never really come back. Pam said, "Well, I wish you would," and shortly thereafter was when he came into the "confessional room" in the office and interrupted Pam's telling the camera how she knew she'd find her match someday and asked her out! YAY!
Some of that sequence may be a tad out of order...I taped what of the episode I was able to see tonight, but the $^&&%$#%^&# DVD on which I recorded it is malfunctioning and won't let me watch it. GRRRRRR. Hopefully it'll be on iTunes shortly.