Finding Dory has been brewing in Stanton's mind for a long time.
Several members of the crew, including the director, visited Monterey Bay Aquarium in California to study and get inspired by Dory's new home.
The idea for Finding Dory came about when the director, Stanton, watched Finding Nemo for the first time in 2010. As he was watching, he didn't know if Dory could ever find Nemo and Marlin again after getting lost. That's when he knew he had another story to tell.
Stanton always knew Dory's backstory and saw her as a tragic character.
The most difficult part about the movie was making Dory a main character and coming up with ways for her to self-reflect, despite having short-term memory loss.
During the writing process of Dory, the writers worked hard to make sure Dory showed some wisdom and didn't come off as too silly.
The most impossible parts of the story were Hank and Dory. Hank was created to get Dory moving across one setting, the Marine Life Institute.