Just watched another playthrough of the game and I just realized something while watching the ending.
Not sure if I'm doing this right but I hope I am, SPOILERS:
I was always slightly confused as to whether or not Ellie knew Joel was lying about the fireflies because of how she just says "okay", but after re-watching the ending of the DLC I noticed something. First off, in the ending of the main campaign Joel says: "I struggled for a long time with surviving, and you.. Not matter what, you keep finding something to fight for." And now we have Riley in the ending of the DLC saying: "There are a million ways we should have died before today, and a million ways we can die before tomorrow, but we fight.. for every second we get to spend with eachother. Whether it's two minutes, or two days.. we don't give that up." Awfully familiar to what Joel is saying huh? I think when Joel said you keep finding something to fight for, it struck a chord with Ellie because Riley said something so similar. Through that, I think it's fair enough to assume Ellie knew Joel was lying about the Fireflies, but was able to forgive him because in that moment he had reminded her of what Riley had said to her.
What do you guys think? Yes? Or am I just crazy?
Anyway, 3deep5me NaughtyDog, 3deep5me. ;_;