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This reminded me of a modern film that had also caught me off guard. It was a scene from Katsuhiro Otomo's 2004 masterpiece, "Steamboy." The artwork in that movie is staggering. Take a look at some of the Matte Painting art here. So about 20 minutes in I continue to be captivated with the incredible work on the background art when all of a sudden the camera rotates the scene in 3D. Whoa!
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Now I know that Disney has been using a blend of CG and 2D cell animation since Beauty and the Beast and that perhaps Tarzan was the first to really use that technique so that it didn't really look like CG but this was so unexpected because this wasn't a Disney-esque background, this was a fully rendered matte painting. Turns out about a quarter of Steamboy uses CG but it's is very difficult to tell. It all fits together so seamlessly.
I certainly cheer artists who surprise me today but I was definitely not prepared to be surprised in a movie from 1935. Check out the Betty Boop short here if you like - I think you too will be pleasantly surprised.