I kept thinking that after they had saved Chloe, the Legion Trio was now going to have memories of her, only they were going to be of her being bad and say that whe was meant to die.
I always thought back a few seasons there was an episode where Clark had problems with his eyes, and I even think he was wearing glasses. They should have had someone close to Clark say something like, "Wow, I didn't even recognize you with those glasses on". That would have given him the idea...