The reason Kabbu is confused is because there's a similar thing going on as with the USA and UK. That's just how they spell it in the North, like how most words that end with 'or' have a 'u' in them in the UK.
The perfect animation, they would all react like this. My favorite was Leif walking in and just enjoying the show because let's be honest, he would find this hilarious.
I noticed you changed Leif's voice pitch a bit so it wouldn't sound the same as Kabbu (and the original source). Good job animating this, as it feels so much like a skit that would happen in the game.