Boo, Hiss! - Free Spot the Differences

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Boo, Hiss!

We hope the solver doesn't have the same reaction to our 15 alterations as the audience does to the villain in this melodrama performance.
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The older Java version of this puzzle is available if needed.

To view the original image: http://www.loc.gov/pictures/collection/highsm/item/2017885512/
Credit: Gates Frontiers Fund Colorado Collection within the Carol M. Highsmith Archive, Library of Congress, Prints and Photographs Division.