I don't think he's talking about the aliasing. I think he's talking about the raster lines you can see in the consistently-colored sections. Look at the dust coming off of the back of the dunebuggy-looking car on the left of the second picture. It's stripy.

I would imagine that this has to do with how the TV draws on the screen. You expect it to be consistent, whereas the TV is drawing in lines that aren't as wide as they should be. I would imagine that you would see the same thing no matter what 480p source you were using. Do you have a progressive-scan DVD player? Try pausing on a scene that has a darkish consistently colored section and see if you see the same thing.