I'm not a big fan of "find the difference games", but this one is probably the best one I've ever seen!!
Oh no, wait... i liked "6 differences" better! ;)
Just two notes:
1º - Some differences simply weren't there... had to use the "click everything" technique and when i finally found them, i couldn't see any diference... :O
2º - I'd like to see a game of this kind with a continue option.
Nevertheless, great job! (4/5)