I noticed. I think it shows what they would look like in comparison to just the actual sizes of the picture. It basically shows the resolution advantage on the Vita. Of course, the game will look better on both screens respectively but it's a good indicator none the less.
Yes, but, I highly doubt the 3DS one will be covered with vaseline. Also... I would think showing the actual resolutions would show the comparison better. Here's the last one scaled down properly. http://www.abload.de/image.php?img=full13dsp4kujigbv6.jpg