It's obvious! When he stops the platter most of the time the previous track is still playing in the mix. Or look at the clouds, they're gone but previous tunes are still in.
I'm completely wrong, sorry. Video & audio are out of sync - it doesn't make any sense at all... check out 1:45 it's obviously a breakdown - hands in the air waiting for the drop - then at around 2:00 people get totally mad.