I haven't seen too many recorded shows where he's talked, so it was a pleasant surprise for him to stay on stage during the intermission and talk for a good 20 minutes.
Also notable is that they played into the intermission with Dies Iraea and picked it right back up after they all got back on stage. Buzz also made everybody act like they had just come back and applaud instead of acknowledge they'd been on stage the whole time.

edit: There was also a few minutes where they weren't aware that Buzz was staying on stage, so they were playing music and had the mic cut while he stood there waving his arms and yelling for them to turn the mic back on.