Puppycorn originally had a light blue horn with a purple base. His paws were originally meant to be navy topped with white as well, while his color scheme was a navy color, rather than the bright blue it is now.

Carrying over from The LEGO Movie, Unikitty's body can change dramatically in ways that should not be possible. The same applies to Puppycorn, having a body similar to his sister's.

Hawkodile's sunglasses move around and change shapes like standard eyes.

This show is a spin-off to The Lego Movie (2014)

Richard was originally designed as a studless sand blue LEGO brick.

Although the official premiere date for the series is January 1st, 2018, 3 sneak peeks for the series premiered first in late 2017; October 27th, November 17th, and December 1st respectively.

Dr. Fox's lab is a location in the Unikingdom's castle.

The plot for "Spoooooky Game" is very similar to "Game Night" from Vampirina, in that they both follow plots on supernatural board games. They even aired on the same day.

Puppycorn was originally colored a darker blue, with navy paws instead of red, and a blue horn with a purple holder instead of a yellow horn with a red holder.

Tara Strong as Unikitty marks another instance of her voicing another princess; Twilight Sparkle from My Little Pony: Friendship Is Magic (2010). The two characters even sound similar.

Second Cartoon Network show to have more than one sneak preview released prior to the show's official debut, that being three, after Adventure Time (2010) with "Business Time" and "Evicted!"

When Puppycorn and Dr. Fox say "Excelsior", they pay tribute to the man who created Marvel Superheroes, Stan Lee(1922 - 2018).