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Muppet Wiki's goal is to be as accurate and complete as possible, using the information that's currently available to us. On the Sesame Street Episode Guide pages, we try to track the earliest appearance that we can find for each insert sketch.
There are more than 4100 episodes of Sesame Street, so assembling a complete episode guide is a long-term project. Therefore, we note the "Earliest Known Appearance" of each sketch, with the understanding that that information will change if we find an earlier appearance of the sketch.
EKA template
Contributors can list the Earliest Known Appearance on episode pages by adding the template -- {{eka|0001}} -- with the four numbers being the episode number that you'd like to link to. That shows up on the episode page as (EKA: Episode 0001), and automatically links to this page and to the episode with the Earliest Known Appearance.