Anachronic Order: Since there is nearly no continuity to keep track of from episode to episode, you'd think it would be impossible to get them out of order. Nevertheless, the DVDs have an episode with Scooter in it before the one in which he is hired.
Keep Circulating the Tapes: Most of Seasons 4 and 5; a few episodes from these seasons did appear on the Time-Life best-of compilations at the Turn of the Millennium but are now out of print. In addition, a few Season 1 episodes lost segments in the DVD box set due to music rights issues.
Nigel: Okay, Zoot, it's time for your solo. Have you looked over the music? Zoot: Do you expect me to play this, man? Nigel: What else would you do with it? Zoot: If I had a match I could put it out of its misery. Nigel: Trust me, Zoot, this is a great little number. Zoot: What if I refuse to play it? Nigel: What if I get a new sax player? Zoot: What if you and I just get right down to it and do this little beauty, huh? Nigel: Good thought. Zoot: Forgive me, Charlie Parker, wherever you are.
Name's the Same: Henson had a childhood friend named Kermit Scott, but always denied that Kermit was named after him. It was a fairly common name at the time, and he just liked the way it sounded.
Non-Singing Voice: Angus McGonagle is one of the series' few examples, though you could hardly classify it as "singing"; his gargling is provided by Richard Hunt instead of Jerry Nelson.
After Jim Henson's passing, Steve Whitmire took over the role of Kermit. Reportedly, Henson himself was grooming Whitmire to take over, so that he could better handle his producing duties (plus he was starting to suffer from tremors in his hands). Steve was a puppeteer all the way back since The Muppet Show when he would perform background characters.
Whitmire initially didn't want to have any lines for his puppetry, since he didn't think he was a good actor, but eventually broke out with Rizzo late in the show. When Whitmire was told he would voice Kermit for The Muppet Christmas Carol, he was apprehensive. He said he had a dream where he met up with Henson and Henson stated that he'd do fine. Whitmire then did the voice for Kermit, and the rest was history.
At one point, Whitmire was unavailable to make an appearance, so they used a mostly unknown puppeteer (Artie Esposito). The reaction wasn't very positive.
Janice is a strong contender for most-recast Muppet ever. She's gone through three official "main" performers (Eren Ozker, Richard Hunt and David Rudman), and has had four alternate performers (Fran Brill in the original pilot and the Muppet Meeting films, John Lovelady in the Julie Andrews: My Favorite Things TV special, Brian Henson in It's a Very Merry Muppet Christmas Movie and Tyler Bunch in The Muppets' Wizard of Oz. And that's not counting Matt Vogel voicing her in the Muppets Racemania video game.
Serendipity Writes the Plot: Miss Piggy's trademark karate chop was scripted on its first appearance as a face slap. Oz couldn't figure out a way to get the puppet to do the slap convincingly, and in a fit of frustration ad-libbed a karate chop. Everybody watching fell about laughing, and the rest is history.
Throw It In: Per the chaos caused by multiple puppeteers. many of the Swedish Chef's antics were improv-based. For instance, one episode had Henson, in-character, dare Oz to make a "chicken in du basket" — throwing the chicken into a pot across the set. Oz made the shot, causing Henson to exclaim, "Tu point!" The exchange was entirely unscripted.