Photos from "Wanna Play?" treehousetv.com page

Well, the first missing image is called title.gif so I think it's reasonable to assume it would've been a logo for the show (remember, GIF was often used even for static images back then because they were small, so it wasn't necessarily an animation.) The second image is called pic.jpg which is throughly non-descript. My guess, it was just a screengrab of one of the scenes in the show. It seems like Wayback just did not care about this page - it only fetched it once and with nothing else in the folder.

We can compare to other shows which did have images with the same name saved. For example, Teletubbies has a title.gif file and it is indeed just their static logo:
web.archive.org/web/20020112143715/http://www.treehousetv.com:80/shows/teletubbies/images/title.GIF

Crazy Quilt has a pic.jpg also:
web.archive.org/web/20010618062109/http://www.treehousetv.com:80/shows/crazy_quilt/images/pic.jpg

So that gives an idea of the kinds of things you could expect to see in those slots. Photos of the actors, or from the shows, along with just a logo most likely.