Archie mentions three guys who work with him, "Stretch" Cunningham, "Little" Emanuel, and "Black" Elmo. All three eventually appear separately in future episodes.
Holly Irving appears as Clara Weidermeyer on two consecutive episodes but is never seen again. In "We're Having a Heat Wave" (1973), Edith does mention that she'd moved away.
Edith states that she and Archie met in the Puritan Maid Coffee Shop. However, in "Cousin Maude's Visit", she says they met in the Puritan Maid ice cream parlor.