On the DVD release of the Animated Star Trek, some episodes were accompanied by Text Commentaries from Mike & Denise Okuda. The commentary for "The Counter-Clock Incident" contains a rather notable error though. The Okudas comment on Sarah April's Capellan Flower, stating that Capella IV was visited in TOS's episode "A Private Little War," but Capella IV appeared in "Friday's Child". The planet seen in "A Private Little War" was never named on screen, but was referred to in scripts as Neural.
This episode contained a slight chronology error. In an early scene, McCoy says after giving Sarah April a tour of sickbay, "Jim, I didn't realize how many of the tools I use in sickbay were designed by Sarah." To which Sarah replies, "As the first medical officer aboard a ship equipped with warp drive, I'm afraid I had to come up with new ideas all the time." This clearly can't be true, since the Bonaventure, not the Enterprise was the first starship with warp drive installed. She must have meant something like she was one of the first medical officers aboard a ship with advanced warp drive installed.
This episode makes absolutely no sense. So what happens when Karla Four's "father" reaches the point of birth - does he crawl back into her womb?!? The accelerated de-aging also makes no sense: people don't get older faster when they travel at high warp speeds in the "real" universe - why do they get so much younger in the reverse-universe? And why do only the people and their uniforms de-age, but not anything else like the Enterprise itself. These problems are sorta explained in Allan Dean Foster's novelization but even he has Spock and others comment on the silliness of these issues. Author Fred Bronson claimed this was due to Einstein relativity, but that clearly doesn't apply at warp speed. In "normal" space the crew doesn't age as rapidly as they deage when travelling at warp.
Robert April: No matter where I've traveled in the galaxy, Jim, this bridge is more like home than anywhere else.
Kirk: Yes, Commodore, I know the feeling.
Robert April: To me she was always like my child. I was there in the San Francisco navy yards when her unit components were built.
Sarah April: But what about us? We don't have to use the transporter. We can remain young, live our lives over again. You could command a starship once more.
Robert April: What a blessing to be able to live one's life over again. If the life you've lived has left you unfulfilled. No, Sarah, I don't want to live it all over again. I couldn't improve one bit on what we've had together.
Majel Barrett is credited but has no role in the episode.
Beta Niobe is referred to as a star gone nova. In the original Trek episode "All Our Yesterdays" this star was mentioned as going nova - a nice continuity touch. The same for another star gone nova, Minara, which was mentioned as ready to go nova in the original Trek episode "The Empath."
Fred Bronson wrote this episode under the pen name of "John Culver". As Fred Bronson he wrote "Menage a Troi" and "The Game" for Star Trek: The Next Generation.
This episode's use of Robert April is consistent with Gene Roddenberry's notes as seen in The World of Star Trek, where he identified April as the first captain of the Constellation-class Enterprise. This is the first and last time he is mentioned or appears, although his use here makes Roddenberry's disavowal of the animated series as canon even more inexplicable.
Allan Dean Foster's Star Trek Log novelization of this episode added on a second "half" of original material which had the Enterprise encountering a strange primitive planet that exists in the middle of deep space (with no sun) with odd contradictions while they oppose the Klingons. It turns out some strange all-powerful race are testing both races, first with the "reverse universe" and then with the non-solar planet. This explains the contradictions in the first half (and the original episode). The Klingons claim they had a similar adventure in a reverse-universe called Nognilk!