The clip show is one of those TV episodes where there’s a bare sketch of a plot that is mostly there as an excuse to run clips from past episodes. It’s probably there to help the people making the show when they have episodes they need to produce in a relative hurry and not enough time to produce new material for all of them.
I don’t think most viewers like them very much. I know I generally don’t.
The episode starts off with an April Fool’s Day premise, with a fairly good original story, where Homer’s constant pranking of Bart convinces Bart to set up a booby-trapped can of beer. The trap knocks Homer into a coma (eventually).
Really, then the flashbacks start, hitting some admittedly pretty good highlights like Springfield Gorge and the Land of Chocolate. The show is just self-aware enough to have Bart remember Itchy and Scratchy for no reason, and Grandpa say comas are like those TV episodes full of clips of past episodes. Those are redeeming moments.
But since the episode in question didn’t see fit to give us some new material, I don’t see the need to do so either.
Though the entire family, Homer included, were a little too amused at the end of the episode over Homer’s brain lose.