The second image is of the Opera House also in the Gold Gulch section. Walt would have relived the memories of vaudeville, and this was the genesis of the Main Street Cinema.
The third image is from the Rio Grande sponsored section showing a tunnel through the Rockies. This image looks very similar to the first tunnel on the Nature's Wonderland Railroad.
The final image is of the Gold Gulch with the period architecture and wide streets. It also looks a lot like the Knott's Berry Farm Ghost Town.