Marsh Family Dinner is very similar to the Original one where Randy tries to convince him to vote.
But Randy calls Stan cynical (Assburgers) hams it up (Mr Queermo style), then a Nihilist (Raisins).
Last grab of Garrison "Fuck em" montage was about fucking the ads (Last season finale).
Cartmens Story, Both Imagation…

I think you've completely looked at the episode the wrong way, it showed the 3 perceived villains, Wells, Eddie and internet darling Iris in a different light.
Harrison's dialogue was identical, which means he knew the role he had to play, he didn't realise he wouldn't like it. It was why he looked so laboured walking…