After Berry and one of the Country Bears get in the bus to find the others, they show a scene with the bus going along a road and Berry leans out the window. Here you can see the side of the bus is spick 'n' span clean. Then, later, the bus is as dirty as it was when it left the shack, very noticeable at the start of the carwash scene.
The Country Bears attraction, on which the movie was based, was originally supposed to be located at Disney's Mineral King ski resort in California. When that project was cancelled (due to opposition from environmental groups), the Bears were moved to Disney World.