We purchased the hidden Mickey book on our trip last Aug. Our entire family had a great time looking for the hidden Mickeys. I agree with travieojmt - we definitely must have looked like complete idiots standing there and staring at walls, light fixtures, etc. People must have thought we were crazy but we didn't care - we had fun. The CMs were very helpful. We were in one of the stores in MGM and couldn't find one of the hidden Mickeys and although the CM wouldn't show us where it was, she did tell us whether we were hot or cold as we searched. On the Great Movie Ride there is a hidden Mickey in the mural on the wall (where you get on and off the ride). We could not find the hidden Mickey in the mural and when we asked a CM where it was (after we had gotten off the ride), he brought us back inside and showed us.
We are returning this Aug. and are also bringing the hidden Mickey book back with us to finish our quest to find all of the hidden Mickeys.