From A to Zoo/Trivia

Trivia

 * This is the last time the characters have their Season 1-2 designs. Every episode after this one has a new, improved design matching the TV series. (An exception being the Break episodes, where the characters still have the previous designs, but only for those episodes)
 * This is the only season finale that Lumpy dies in so far (Debatable, he may have survived the crash at the end of the episode).
 * If Flaky and Lumpy survived or died in the bus crash instead of being killed by the baboon, Cuddles would be the only character whose death wasn't caused by an animal.
 * In the beginning of the episode, all of the kids except Flaky sing the HTF Theme song when entering the Zoo. The other times the characters sing the theme are Cuddles, Flaky, and Giggles in This Is Your Knife, and most of the cast in Happy Trails Parts 1 and 2. They would all later sing the song again in Take a Hike.
 * Lumpy would later go camping with the same group (with the addition of Nutty) in Take a Hike.
 * Funnily enough, the animal that Lumpy makes out of Cuddles' eye is a rabbit, just like Cuddles.
 * Cuddles is indirectly responsible for Toothy's death, as he made the rhino angry in the first place.
 * This episode and A Sucker for Love are the only internet episodes that are as long as the TV series' episodes.
 * Lumpy is shown to be left-handed during the entirety of this episode.
 * This episode makes Lumpy and/or Flaky (Debatably) the last characters to die in the second internet season.
 * This is the last episode in which Sniffles has a long snout. In all future appearances, Sniffles' snout will be shorter (first shown in the previous episode).
 * The picture Lumpy takes of Sniffles shows him with his short snout.

Cultural References

 * The title of this episode is a parody of the phrase "from A to Z", which means from start to finish.

Superlatives

 * This is the second time that Flaky cries. The first was in Ski Ya, Wouldn't Wanna Be Ya!.
 * This is the second time a vehicle crashes after the closing iris, the first time was in Treasure Those Idol Moments.
 * Coincidentally Lumpy dies in both vehicles and Flaky is also on the vehicle. (Those she was bloody mush on the latter.)

Continuity

 * This is the second episode in which Lumpy is a bus driver. The first is Happy Trails Pt. 1.
 * Coincidentally, both episodes are season finales.
 * The buses in both episodes looks exactly the same.

Production

 * Despite Ellen Connell replacing her at this point, this episode is the final time Dana Belben is credited, as they used her old voice clips.