I saw the Maniac Mansion run live. I got a bit worried when I saw the speedrunner get frustrated, but they didnt let frustration stop them and finished out the run. Its just good showmanship.
And of course, Frozenspade is always a good watch at a GDQ. He's just really good at both performing a speedrun and giving live commentary, and this is no exception. Its a bit of a shame we couldn't hear the live audience during the song, but it doesn't matter that much.