I've often wondered if the first three "Bert and Ernie at the movies" segments were shot on the same day. The "loud and soft" and "lady with tall hat" segments both have many of the same extra background characters, though in different seats, while the "emotions" one has mostly different additional characters, so maybe that one was shot on a different date than the other two. But now I think those earlier "at the movies" segments were shot on the same day as the Sesame Street News segment where Kermit asks people what makes them angry. Most of the characters in that segment (whether they get lines or not) are also movie theater customers, most of whom are anything muppets with the same clothes and facial features. Grover appears in the News segment and at least one of the movie theater ones (wouldn't it have been something if Kermit was at the movies with Ernie and Bert?).
I believe all the characters from that particular news segment (except for Kermit) is a customer in one or both of the movie theater segments, while most of the theater customers are in the news segment (only Bert, Ernie, the usher, and the lady with the tall hat are absent from the news segment).