About my addition to the flash...
To the people who view this flash, about that one level I put in, I really just snuck it in while Jake was in the bathroom just to see what people would say about it... and sort of just to make Jake laugh. (Jake makes flashes at my house since he doesn't yet have his own computer at his house, and his family computer is full.)
What I would really prefer to be credited for is for helping Jake with any problems he asked for help with in the flash, and to give general advice. (Example: To put the button for each level on both sides where the difference is rather than just one, and to put a button across the whole screen that does nothing so the pointer won't give the answers away.)
And since this is a review, I suppose I have to give a score... I'd say... 3/5. It's pretty good, and you put a lot of work into it, but it could use better art and/or more objects in each picture, (like a sidewalk full of people rather than one person on a sidewalk,) and like you mentioned earlier, start thinking of a way to put multiple differences in each picture. Unfortunately, a 3 would help your flash, but I can't add it in because you already voted on your flash using my computer, which means I can't vote with my IP address on it today.