An animatic for the series was posted on Vimeo, but was later taken down after it was discovered by and shared among fans.
Bowdlerization: On Nicktoons TV (the UK version), the episode "The Blister" is edited to remove Blister spraying himself in the face with a fire extinguisher (as the UK censors do consider that dangerous behavior with no obvious signs that the action is considered unsafe to copy in real life).
Children Voicing Children: Most of the children have child voice actors, the exceptions among the main cast being Dade and Princess.
Creator Backlash: C.H. Greenblatt expressed disappointment in Nickelodeon for canceling the series and burning the remaining episodes off on Nicktoons, which gets a fraction of the audience that the former has, without even telling him, and finding out on the Nickelodeon Twitter account. Even worse is that Nickelodeon forced him to make a public apology.
"Steampunks" aired a third of the way through season 2, but it uses the season 1 opening and Michelle is still in her egg.
"A Tale of Les Squirrels" was aired as the fifth episode, but was actually the second episode produced after the pilot.
Screwed by the Network: As Greenblatt noted, Nickelodeon unfairly expected the show to be an instant success. When it didn't get SpongeBob-levels of ratings, they switched around timeslots, went months in-between episodes, cancelled it after two seasons, and moved the last episodes to Nicktoons to make room for SpongeBob SquarePants and The Loud House reruns.
After the series concluded on Nicktoons in December 2017, reruns of the show were placed in the death slot between the hours of 2 AM and 5 AM, additionally episodes are no longer viewable On Demand.
On June 18, 2018 the show was removed from Nicktoons for unknown reasons but returned in July with a more appropriate afternoon timeslot along with On Demand viewings. Presumably in response to the show being put on Hulu.
Short Run in Peru: Despite the finale airing in December 2017 in the US, it aired in some countries such as in Africa and Europe a few months earlier in July/August. This also affected the other final episodes. Prior to their US airing they were uploaded online as unreleased episodes.
Tuckerization: What does the "H" in C.H. Greenblatt's name stand for? Harvey!
Harvey's last name was going to be "Tweets", but Nickelodeon didn't want to get in a lawsuit with Twitter. As a result, they had to change his name to "Beaks" to avoid getting into trouble. (Any Season 1 dialogue with Harvey's last name had to be re-recorded)
Jackson Brundage, the original voice of Foo, was also going to voice Dade. However, C.H. Greenblatt decided to take over the voice of the character because he felt his voice would be funnier for the character.
In the original pilot version of "Pe-Choo!", Techno Bear was an adult and spoke with a Russian accent.
Had the show not been monumentally screwed over by Nick, Greenblatt had planned some elements for a possible third and fourth seasons:
After Foo and Fee's parents returned in the Season 2 finale (which ended up being the series finale), they would've moved to Littlebark in Season 3, and the twins would've acted as parents to their own parents. Also, the Season 3 finale would've been about the past of Harvey's grandpa Roland, and what happened to his wife. Afterwards, he would've permanently moved with the family in Season 4.
One scrapped episode idea featured Miriam getting sent to prison after getting into an argument with her mother (who is a retired judge).
Working Title: Had a bus-load of them during the series' development, as well as production of the pilot and most of Season 1.
The original title was "The Terrible Three", but it sounded too childish and bizarre.
Another old title was "Grass Stains" which didn't make any sense.
"Woodlandia" was another early title for the series and presumably the setting's original name.
The series would've also been named after its main setting, "LittleBark Grove".
"Bad Seeds" was also the name of the series during production of the pilot and most of Season 1. According to Greenblatt, he was unable to keep this name due to copyright issues, so the property became renamed.
"Harvey Tweets" had to be changed into "Harvey Beaks" as listed above.
Write Who You Know: The episode "Icky Chicky" was based off a writer's experience babysitting a boy who still kept a chicken plush from his infancy. By that point, the toy was completely worn out, looking almost exactly like Harvey's own Chicky.