Each episode is numbered, and this number is displayed at the start of the episode.
The episodes that originally aired on a Friday somewhere between 1969 and 2000 had an additional message in the funding credits saying "Recorded at Reeves Teletape III" until 1987. Starting around the 18th season of the show, the message then said, "Facilities by Unitel Video, Inc."
Most episodes aired from 1969 to the 2000s do not have complete closing credits; ending credits usually appeared at the end of the Friday installment, or when another weekday episode ran short.