These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Growing the Beard: The first video is fairly forgettable, but the second one is where the series starts to pick up some of its Running Gags and recurring characters (starting with the Angry Gorilla and "very thin ice".)
I Am Not Shazam: The band is called The Gregory Brothers, their main YouTube channel and website is called schmoyoho, the show is called Auto-Tune The News, and the B-sides are called Songify This. The massive amount of names has led to them being used somewhat interchangeably.