Rita Moreno first said "Hey, you guys!" on episode 19 (season 1, show 19), which became the series' catchphrase in episode 131 (season 2, show 1). It opened every episode for the rest of season 2, vanished from episodes 261-520, returned in episode 1A (season 5, episode 1), and lasted until the final episode, 130B (season 6, show 130).
Marvel Comics allowed the show to use the character Spider-Man for free. To commemorate the partnership between Marvel and the Children's Television Workshop, Marvel published a special series called "Spidey Super Stories", easy-to-read adventures of Spider-Man that occasionally featured members of the Short Circus. A shortened version of the comic, featuring only characters from the Marvel Universe, appeared in the Electric Company's spin-off magazine.
The release of the Best of the Electric Company DVD boxed set on 7 February 2006 marked the first time in Sesame Workshop's history that unedited episodes of actual shows from its library were made available for purchase by the public.
For the "Letterman" sketches, Gene Wilder and Zero Mostel were so excited to be working with each other again that they recorded their dialogue together, a rarity in animation. The two worked together in one film during the show's run, Rhinoceros (1974). Wilder was devastated when Mostel died in 1977, soon after the show ended production.
The first 4 seasons were numbered in consecutive order, 1-520. Season 5 was numbered 1A-130A, and season 6, the last season produced, was numbered 1B-130B. A total of 780 episodes were produced, 130 per season, like its sister show, Sesame Street (1969), did until 1998.
Because sketches from previous seasons were reused in the same way that Sesame Street (1969) reused its sketches, the first season was in production for approximately 26 weeks, and this dwindled down to approximately 13 weeks of production for the sixth and final season.
The Blue Beetle appeared on the show toward the end of its run. It was created by the show's writers, and unrelated to the version owned by Charlton Comics, which had ceased publication and was going through bankruptcy at the time. The Blue Beetle character is now owned by DC Comics, and a new, unrelated Blue Beetle has recently come upon the scene.