Edgar's apperance throughout the movie
When the bug first takes Edgar's skin it looks pretty much just like it did, but as the days go on the skin naturally begins to decompose and fall apart. When he goes to morgue and talks about getting the cat back look how horrible the skin looks, the eye is glazed over as well. By the time he goes to get in the spaceship at then end the skin is nearly rotted and useless!
As a kid I kind of noticed it but didn't really think of it, but its really genious work by the costume and visual designers!