I enjoyed this.
So Elmo was often called "AM Elmo" in scripts for insert segments? Did they do that with any other characters with no distinct personality (like "AM Maurice" or "AM Harvey")? I feel this should go in the main Elmo page on the wiki.
So is that one Elmo appearance from season 12 the only season 12 episode with that incarnation of the character, or is it just the only one you've found so far?
I would have thought Richard Hunt started performing Elmo in season 16, after Brian Meehl left. In fact most official things about Elmo's performer transitions either say or imply that Elmo was taken over by Hunt because Meehl left, and since Meehl has said that he only remembered five or six performances as the character (and he could have performed him a lot more times than he remembers), I assumed he started performing Elmo near the end of his run, like in season 15, but as said the scripts do confirm Meehl around seasons 11 and 12 (and I starting wondering about this when more season 12 episodes surfaced and I noticed it looked like all the newer characters were performed by either Meehl, Earl, Prell, or Clash and felt if he had a regular role talking in sounds he'd have a consistent performer). Though now I wonder if maybe he just stopped being the regular performer and they continued to use the puppet randomly (sometimes with real dialogue, like in "Handful of Crumbs") for years with any performer.
In the last few days I've started to remember an old Tough Pigs page listing recast history, and I recall in its listing for Elmo, it said Meehl performed Elmo from 1979-1981 and Hunt from 1981-1984, while the same page said Meehl performed Telly from 1979-1984, I remember being confused, wondering why he'd stop performing one character while still on the show for years, and being surprised that Hunt would have performed Elmo for more seasons (since he hated the role so much he gave it away), but of course this was before Muppet Wiki and before we knew to cite sources, but even back then I figured it was a mistake. Either way, Danny Horn wouldn't have had access to CTW Archives documents, scripts, copies of episodes from mysterious sources, or other stuff that fans/wiki contributors have gone on to have access to back then.
Somebody pointed out that one of the Richard Hunt clips that appears in Being Elmo is episode 2011, the same number as the year the documentary came out, and I noticed the other clip is from episode 2018, the same number as this year, but in looking at those redlinked episodes, I found that another of his early appearances was episode 1969 - matching the year Sesame Street began!
I used to think that the "Grover sells newspapers" segment was from the early 1990s, maybe late 1980s at best, but eventually figured it came before Kevin Clash was the character, as Elmo was portrayed as part of a marching band consisting of monsters with no real personality. I figured if it came later they wouldn't use Elmo or should have used more main monsters like Telly or Zoe. And then I found that its EKA was a season 16 episode (and later I believe I saw a season 16 episode confirmed as the first).