That's very odd indeed. What I find even stranger is the one linked in the Wikipedia article has noticeable more detail. To the point that I'm not even sure your photo could be photoshopped into the one on wikipedia.
http://upload.wikimedia.org/wikiped...erella_Castle.jpg/819px-Cinderella_Castle.jpg vs http://farm6.staticflickr.com/5302/5594197470_dfe3b63b72_b.jpg
I have to agree.... When I looked at the largest version of the one on Wiki and compared it to the one on the flickr page the one on Wiki has a lot more detail in the brick on the castle as well as some other spots... It would almost seem like the one used by Wiki is the original and the flickr is the copy.