ITA agree with this as well. I, too, have thought long and hard about that "spare tire" compartment. Haven't looked up that car model to see if it was one that had the spare tire in like an indentation with a carpeted flap that covers it over. Very easily spare tire taken out and discarded and poor little Caylee curled up in there. And yes, Casey not knowing where she is - that has stuck with me. She could REALLY NOT KNOW where her "final" place was because she wasn't the one that put her there.
IMO - She washed the clothes - I believe George had gone through that car and put those things on the floor of the garage. When Cindy came home he just said "take those things in the house and you can wash those pants". As for finding Amy's number. CINDY has said she got the number out of the car but, again, I think George brought that piece of paper inside to her or gave it to her when she was putting the laundry in (their machines are at the back of the garage next to the "inside" door of the house. George gives her the piece of paper and tells her he's got "things to do and will be back later". Cindy goes inside and calls Amy and is off on her Casey goosechase.