Random Laughter
Simon & Garfunkel performed on this special. They did a few of their regular numbers, primarily with just Simon on guitar, and then sang with Andy Williams.
During their opening number, "Mrs. Robinson", there were random bursts of (what I'm sure was) canned laughter. It was just really odd. I don't consider that song to be funny and the laughs didn't seem to coincide with a lyric that was amusing.