Yeah, I watch the 3 videos and the "interview". The interview is definitely his weakest. Nothing to back his underacting and he breaks character momentarily.
I don't understand Mute Spittah. I know his thing is to be mute, but I don't really know what he is doing most of the time. The only joke I really understood from him was when he materialised the drink and poured it out. The gestures and body movement are out of context to me.
I know that it's a parody and such it's there to invert and subvert your expectations. The problems is that I don't know what the "normal" social rules and etiquette to begin with. It is also why the first video is the strongest. It introduces most of the base rules to the uninformed audience on the fly as needed. You don't get the full rule set, but you get whatever is related to the punchline. The 2nd and third videos doesn't have that. Watching the first video helps, but a good portion of the time, I have no idea whats happening.