You know, I never could help but notice that it seems as though the producers of "The Letter People" were VERY much inspired by "Sesame Street" in many ways. Now don't get me wrong, I'm not trying to accuse the show of plagiarism in any way at all, but I just think it would be interesting to take note of various aspects of "The Letter People" that were inspired by characters or segments seen on "Sesame Street", besides the fact that both shows use colorful puppets, and teach letters of the alphabet.
First off, it's quite obvious that the Letter Person, Mr. M, was GREATLY inspired by Cookie Monster. You can tell by the way he's designed and built similar to Cookie Monster (both live-hands puppets, have no elbows, have black mouths with opening in back to "swallow" foods), and in his debut episode, Mr. M goes to a market where he devours melons and a bag of marshmallows, very much how Cookie Monster feeds himself cookies, or any other items.
There's an animated segment in that same show where a painter is told by his boss to paint an M. Somehow, this segment to me reminds me of one similar to this on "Sesame Street" from the early 70s with a grouchy, gruff-voiced boss questions a carpenter on how a brush is used for putting up wallpaper.
In Mr. T's first episode, there's a live-action film segment with children (similar to ones we've seen several times on SS) whose names begin with the letter T, and play musical instruments that start with the same letter. Well, anyway, the children keep coming out one at a time from behind a tree standing in the center of a field. Then while the children play their music together, the tree actually COMES TO LIFE! I can only say that someone from "The Letter People" may have liked the idea of a talking tree puppet as seen on SS in the first "Here is Your Life" segment with Guy Smiley, and wanted to use one on their show.
There was also an animated segment in this same episode that involved red sand forming a capital T and a lowercase t. This may just be a coincidence, because I believe those "sand letter" segments from SS may not have been used on the show yet by the time this episode of TLP was in production (possibly 1973).
In Mr. F's episode, there is an animated segment with yellow dots illustrated words that begin with the letter F (follow, fat, five, footprints, etc.) that looks quite like any of those various segments on SS featuring dots forming patterns that link between other segments, as seen in the first episode. Also, in another segment following this one, Mr. F talks about the difference between a capital F and a lowercase f, not very soon before a monster shows up and throws a Frisbee. This kind of feels like an imitation of one of Kermit the Frog's letter lectures when a monster interrupts.
An animation in Mr. H's episode has two boys at a zoo with balloons each with an H on them. I'm almost beginning to think that there was a similar segment like this on SS, but I'm not quite sure, though.
A couple of interesting things I've noticed in Mr. N's episode. There's a segment where a librarian reads a story titled "Nancy the Nannygoat", and sure enough, there was a cartoon on SS with a character of the same exact name.
In the same show, there's some strange fuzzy, green monster (same from Mr. F's episode) called "the Nasty", who looks and sounds very much like
Oscar The Grouch. The scene includes Mr. N and some Humphrey Bogart-type of detective named Nardo (who regularly appears in other episodes). This particular scene takes place in an alley at night, one that looks very much like the set for that "Golden AN" segment on SS.
In Mr. B's episode, there are a few interesting things I've taken notice of, which I can't say for sure were inspired by anything from SS, or else created by Jim Henson since I really don't know for sure if anything similar to this had been seen on SS during the early seasons, and I just don't have proof of it. There's this talking bulletin board with moving eyes, eyebrows, mouth, and mustache. It also has push buttons and a blue chromakey screen. On the screen we see strange puppets with actual human heads showing different things that begin with the letter B. I can't say for sure if there had ever been a time that these kinds of puppets were ever featured in a segment on SS (if ever, they would've involved either the human cast members or else even on-screen appearances by the Muppet performers), although this does seem like something that we would see on "The Electric Company". There's also a scene where Mr. B meets a talking capital B and a lowercase b. Now I know that SS had long featured talking letter puppets from time to time, but have they ever had any like these during the first few seasons? The talking Bs on TLP were the kind with the elastic mouths controlled on very thin strings (very much like the bulletin board previously mentioned). I do remember seeing these kind of puppets on SS, but I don't know if these had been fashioned first before TLP.
There's also some animated segments in many of these early episodes of TLP involving three shapes - a square, a circle, and a triangle, that demonstrate the concepts of start, middle, and end, in order for children to learn the proper placement of letters to spell words. Weren't there animated segments with shapes similar to this on SS?
Also, the game show host character, Monty Swell, who hosts "The Catching Game", was likely inspired by none other than Guy Smiley. Both game show hosts, and both puppets built uniquely for their own character (unlike how on TLP, there are interchangeable human puppets similar to the Anything Muppets on SS, Monty Swell was used primarily for just that character alone, just like how Guy Smiley, although at first infrequently used for other characters, he seemed to only be reserved for only himself in that sort of way with non-removable features, such as his moving eyebrows).
In the first episode of "The Catching Game", Monty Swell asks his contestant to identify a fan, among three other objects in a four-square grid on a magic board after the Letter People spell the word "fan". This almost looks like a set-up for a game of "One of These Things" or "Three of These Things" from SS.
I don't know if anyone who had seen these episodes of "The Letter People", have ever noticed these similarities between this show and "Sesame Street", but I find it VERY interesting to think that the producers of "The Letter People" were likely inspired by "Sesame Street" in many ways. As I had said before, I'm not accusing anyone of plagiarism, I'm just stating that one show can be influenced greatly by the creative works of others'.