I just re-read the bolded conversation between Lee and Casey and yeah, totally makes sense now.
I think that, perhaps, she was talking about a phone or a SIM card when she was talking about going to Universal for "not necessarily fun" and he was clarifying. I think she dumped a phone/SIM card there.
THEN, I think he changed directions and was totally talking about Caylee. Her recent story change coincides with "I know I had it at Jay Blanchard Park, I don’t remember where the very last place is I had it." She says she took Caylee to Jay Blanchard to meet ZG. (Lie) However, something about the park and Caylee seems to be true.
Look at this map:
http://maps.google.com/maps/ms?hl=e...d=112207365672542480712.000455b4884de4fdc7516
and see if anything rings a bell with this statement of hers where she says she got the Blackjack: "Through the AT&T Store, ***, what road? It’s the bottom left side of town kind of near where the mall and stuff is."