I have a bit of things to say now....
It's great to finally see an image for The Mudman in Muppet form. He actually looks less like Biff to me than he does in illustrated form. And it's great to have a performer known for him (I figured it was probably Jerry Nelson).
And great to have an image for a broadcast version of The Sound of the Letter A. While currently I can only look at the image, for years it had been one of my most-wanted clips to see (back in 2014 I wrote a Muppet Mindset article on the top four Sesame Street clips I most wanted to see, including that one... and now the only one that the wiki doesn't have an image for, last I checked, is Snuffy singing "Nobody"). The wiki notes it being sung by Big Bird in three different episodes. Do the scripts note if they're all the same clip or if they're different tapings of Big Bird singing the same song?
Thinking some more about how much episode 1259 changed from script to air, I wonder if maybe they thought the idea of Caroll Spinney performing Bruno and Oscar at once was too gimmicky to be the focus of an episode. Or if maybe they thought it'd be too much work for Spinney to be inside Bruno with Oscar for a whole episodes plot (but then would it be any different/harder to perform Big Bird for a whole episode?).
Actually Linda first appeared during season 2. But this is most likely her second appearance
I forgot about that until after I was away from my computer. But at the very least it's a proper introduction for her.