Just the HHN decor that doesn't get covered up. For instance, last year, the crashed UFO was visible during the day. Also, most of the Trick 'r Treat scare zone was visible. There were a couple of scenes that needed to be covered during the day, though.
They don't do anything else as imprint said........it`s all for HHN in Studios.
Some displays are quite gory, so they get covered during the day and the only ones you`ll see are the larger displays that are too big or totally inoffensive to day guests.