When Tae Kwon Doug says "My method is better than a meth od", the guy on the far left if the screen is mouthing the words along with him.
When Douglas speaks Korean, he says "Yobosaeyo" which is used only to say hello on the phone.
Carter's weed dream in front of the fridge is adapted from "War in Bananastan", a short video from the Red Letter Media animated YouTube series "Produce Isle".
The actual German expression would be "erschreckende Glückseligkeit". The German language loves to make compound words but there are limits.