Chross Guide to the Spanking Internet pointed out an article entitled 12 Films with Sexy Spanking Scenes on a site called The Frisky. The author selected 12 scenes from movies, an interesting selection but considering the title I believe there are many more superior examples.
There also was an element of the slapstick in spanking scenes so I thought I would post this short clip. This comes from a movie called A Cinderella Story. This story has been retold many times but this version is somewhat twisted. The evil step sisters get some payback in a car wash. Not really spanking but odd enough to note.