The show's original name, "Bad Seeds", had to be changed, due to copyright issues, into "Harvey Beaks".
The title character's first name is the middle name of the show's Creator C.H. Greenblatt.
C.H. Greenblatt managed to hire much of the show's crew based on their work that he found on Tumblr. Many of them had never had experience in animation prior to working on this show.
Foo was originally voiced by Jackson Brundage, but was replaced later on in season one, by Tom Robinson.
The character "Technobear" was originally written as an adult, with a Russian accent.
Just before the credits of the season one finale, a depiction of Chowder, from the Creator's previous series, can be seen at the party.