effect

Hey guys, I was just watching through Tom Betgeorge's Wizards in Winter video, just getting inspiration (obviously a LOT of stuff I want but can't afford), and I was trying to figure out. Just how does he get the whole house 'strobe' effect from 2:52 onwards? It strobes whole models on and off...

I am wondering if anyone knows where to get, or has any short Christmas related audio files (5-10 seconds). Looking for some like this https://www.dropbox.com/s/9innj6zin0uigz0/Ho%20Ho%20Ho%20Merry%20Christmas%20Sound%20Effect%20copy.mp3?dl=0 I was going to use them in between sequences at...