The school, playground, and treehouse all get updated for the new generation:
The school doors change from orange to green; the windows have a green trim rather than white; and it now has a wheelchair ramp.
The classroom has been rearranged completely, looking almost nothing like previous seasons.
The playground gets more plants, and a red bench surrounds a tree. The fences have also changed to green rail fences.
The treehouse gets a totally updated, looking nothing like its Season 3 counterpart. Near the back, there is a huge round table, where the kids have snacks, read books, and even make arts and crafts (using the Barney Bag!). In the back of the treehouse, there is a ship wheel that the kids use to pretend that they are sailing. In the front of the treehouse, there are benches that look out to the outside deck of the treehouse.
In addition, a lookout is added to the treehouse. This is where the kids pretend to fly an airplane or watch for a special surprise to come. There are stairs that lead up to the look out, and a slide that connects from the lookout to the back of the treehouse.