Knowing it and seeing it are two different things.

“Finally, Peeta turns to Pollux. "Well, then you just became our most valuable a…”

“Because it doesn't matter anymore, and because I'm so desperately lonely I can'…”

“Hey, Finnick, come on in! We figured out how to make you pretty again!”

“Oh, my dear Miss Everdeen. I thought we had an agreement not to lie to each oth…”