In the subtitles, in the line "You lend us a hand, now it's your turn to take ours", the word "turn" is missing.
Additionally, during the segment where Five helps Three, the subtitles misinterpret the word "yelp" as "yell". This is most likely a mistake as the world "yelp" fits in with the rhyme scheme of "help" and because Eight can be heard saying a "p" sound.
Trivia
This episode's description used to show that it's a crossover with Alphablocks, but it was later removed.
This tweet from the Numberblocks Twitter confirms that the crossover idea was either scrapped or was a mistake.
This episode was put on iPlayer on Friday, a day before it is aired on TV.
Twenty-One is the only Numberblock in the episode to not be a number from 1-10.
Eight only appears as a cube in this episode.
This marks the first time where a Numberblock smaller than Twenty-Seven only appears as a 3D shape (with all coordinates being bigger than 1) in an episode.
On the YouTube upload of the special, meant for people overseas who want to watch it, the thumbnail unintentionally spoils Captain Hexbeard's true identity being Twenty-One.
Despite being a special, people still consider it as the 121st episode of the show.
