Oh! I just thought of a minor mistake I always made! In the song Rainbow Connection, you know the line: "so we've been told and some choose to believe it"? Yeah, I always thought the line was: "so we've been been told assumptions to believe in." Strange.
For some reason before I got the soundtrack album I thought it was called "The Rainbow Punishment".
A few more misconceptions that I had...
I used to think that Jim Henson was the creator and person in charge of Sesame Street, including ALL of the non-Muppet inserts. Ironically, I think I first learned that the show used a variety of animators and filmakers around the time Sesame Street Unpaved came out, when I first learned that Jim Henson worked on some of the animation and live-action films (and I sort of feel like I was surprised when I read that fact). Ironic because I think Jim Henson was the only person acknowledged as an animator/filmmaker on the show in that book.
Also, for many years I thought that the only non-Muppet contributions Jim Henson worked on were the baker films and the King of 8. King of 8 and Song of 10 were the only Henson contributions in Sesame Street Unpabved, the page for the 10 Song mentioned Henson's invovlement in that and King of 8, and those were the only non-Muppet SST contributions mentioned in the Jim Henson biography page.
I used to think that the reason Skeeter wasn't around in the adult Muppet world was because she died. I think I just made the explanation up myself, but I beleived it to be the reason.
Once my household got the internet and I learned more about Muppets there were a number of things I read that I thought were different, especially on Bill Sherman's Muppet Home Page. I read his Muppet Show episode guide, and under the entry for the Bruce Forsythe episode, it said "only episode I don't have - Trudge trudge streaka streaka!" That made me think that "Trudge Trudge Streaka Streaka" was part of that episode as opposed to just posting an annoyed grunt over not having the episode. Also, the entry for the Valerie Harper episode mentioned "Valerie and the Clodhoppers", and I assumed the Clodhoppers were the Mutations.
Also, after looking at a number of character and performer lists, I thought that Betsy Bird was Fletcherbird. Yes, I did think Fletcherbird was a male before that, and I guess the fact that Betsy was only in one episode made it difficult to know who she was to those who hadn't seen the James Coburn episode.
While I did see The Jim Henson Hour when it was broadcast, for many years I thought that the MuppeTelevision half took up the whole hour. I remember seeing the first episode and being surprised when they stopped showing Muppets, without seeing the end credits.
When I got the "Muppet Hits" album and read the performer credits, I noticed that it listed Annie Sue Pig among Louise Gold's characters, and I thought that "Annie" and "Sue Pig" were different characters. And I thought that this "Annie" was Mean Mama. Even more confusing: The first time I heard Annie Sue mentioned by name was in the Roger Moore episode, and as I recall Roger only referred to her as "Sue".
It wasn't until I got the internet when I learned that Nickelodeon cut entire scenes from The Muppet Show. I had been familiar with the promo for the Playhouse video releases and when I first saw the Loretta Switt episode I was surprised that the Loretta Switt clip wasn't in her episode. It made me wonder if she was in another episode though I was sure none of the guest stars appeared multiple times. I was also confused when I got the "Monster Laughs with Vincent Price" video and saw that "You've Got a Friend" wasn't included (never saw the episode on Nickelodeon). And now I realise that it never occured to me that those could have come elsewhere (after all, Gonzo Presents Muppet Weird Stuff had clips from the movies).
Back when Nickelodeon aired Muppet Matinee I'd check the TV listings to see what was going to be on (many of the specials shown I hadn't known about yet). I saw Miss Piggy's Hollywood and The Fantastic Miss Piggy Show before I first saw all of The Muppets: A Celebration of 30 Years, and when seeing those specials listed I thought those included the clips shown in commercials where Miss Piggy got out of a limo and the flashdance parody (having forgotten that a clip of the flashdance parody was in The Secrets of the Muppets). When I first heard about The Muppets Go Hollywood I also assumed the flashdance parody was in that special, as opposed to the I'm Gonna Always Love You music video.
Finally, I recalled seeing a clip from Rocky Mountain Holiday with John Denver and the Muppets in the openign montage of the 30th anniversary special. I was also very familiar with the promos for the Playhouse video releases, which showed a clip of John Denver from the Grandma's Feather Bed number, and putting these together I thought that the John Denver episode was about camping. Of course this turned out to be true, and I expected that clip of John and the Muppets over the campfire to have been in that episode, and was confused when it wasn't, when it ended with Kermit camping without John or the other Muppets. It wasn't until a year later when I learned that Denver and the Muppets did a camping special.