Zachariah OHora is a commercially successful children's author and illustrator based in
Philadelphia, known for his picture books featuring bipedal animals such as
Wolfie the Bunny,
Niblet & Ralph, and
My Cousin Momo. Natalie Engel, the Director of Content for Children's Programming, approached OHora, liking his art style, to create a television series. At the time, OHora had created a raccoon character called "The Collector", based on OHora's own collecting habits, who had not been used in any of OHora's stories at the time.
Carl the Collector was produced by Fuzzytown Productions and
Spiffy Pictures, both of which hired
neurodivergent people in a variety of occupations for the production team. The child characters are portrayed by
child actors. Both autistic characters, Carl and Lotta, are portrayed by autistic child actors; Kai Barham and Maddy McIlwain, respectively. Lotta was written in addition to Carl to reflect the autism spectrum. Many specific details about Carl were figured out in the animation process such as his
stimming. According to Whittick, her team created animation cycles of stimming and sent them to PBS Kids and advisors for feedback. To make interactions in the series feel natural, the
pacing was deliberately slowed down, with influence from
Charlie Brown cartoons, and voice-acted lines were often kept unedited. "The Fall", in which Carl discloses his autism to his friends, was written for viewers to learn the reasons behind Carl's mannerisms, according to writer Ava Xiao-Lin Rigelhaupt. ==Broadcast and reception==