Yes, I agree that there needs to be more screenshots from episodes that are not accounted for yet. I wouldn't be shocked if COVID-19 restrictions delayed the process. I especially would like to see what episodes are confirmed to have aired on Episode 1800, as I could have sworn I recall seeing the "R Car" skit in the slot that had a heavy and light segment in the original script. The one segment I am interested in seeing an image of in Muppet Wiki is "School is Cool Counting". I remember seeing that segment (which was supposedly computer animated) on a repeat episode on February 11, 1983, and it started with a boy counting ten toes. Aside from that episode, it also appeared on Episode 1741 in January 1983 (possible initial airing), and maybe one or two more episodes in 1983.
There were two "School is Cool" segments and they were aired only in Season 14. The other is "School is Cool Reading", which was shown just one episode. That episode was uploaded on the Internet, and so was the standalone segment.
That particular episode also has the initial airing of the very hilarious "Ernie & Bert releasing balloons" - which ended to Bert's anger getting the best of him, and creating chaos through the apartment in the middle of the night, only for Ernie to ask Bert to hold it down - that segment was shown only four times, but I do recall seeing (and recording) it on Open Sesame on Treehouse TV in 2001.