I love how they are constantly shown to have each others measure. When Jack says "Save me!" and comments (in response to Will's observation "Doesn't look like much") "Neither do you. Don't underestimate it." He proves worthy every time. Will, without being told (as Liz was), knows what Jack does or does not consider freedom, and recognizes his distress ("He thinks we're a hallucination") when no one else seems to. By the time AWE is in full swing, they're actively switching places ("I said to myself, think like Jack"; "Think like the whelp. Think like the whelp.") and doing an excellent job of it.

And there's all that blatantly J/W merchandise. Can't forget that. I really should collect a bunch of it and embarrass myself by posting a pic to show just how much there is...