There is an actual Manbearpig easter egg in Red Dead Redemption 2
During filming of The Daily Show, Al Gore was asked about the way South Park had portrayed him and ManBearPig in this and the following episode, and said "I thought it was a hell of a statement by South Park, and I appreciated it a lot".
In Al Gore Jr.'s height chart the "human" looks like Morty from Rick & Morty.