At first, changing the mugs of beer to root beer sounds like Frothy Mugs of Water censorship. However, root beer is actually made similarly to actual beer, this includes fermentation. It can also be modified for more alcohol content. In a way, this isn't just going around the censors, but using a little known fact to their advantage.
Monstro closely resembles a Basilosaurus, one of the ancestors of the whales.