As you enter the show-building, you travel through a long tunnel, you are moving underneath the Disneyland Railroad tracks. Along the way you see stylized travel posters from locations all around the world.
Other than the North America scenes, nothing is MAJORLY different. But a lot of Disney fans regard this attraction as THE BEST small world around the world, because it has fantastic scenes with more depth and detail and color.
The holiday layover debuted last year, 2009, and continued the Holiday layover tradition. Video (courtesy of DLRP Today) below of ride through.