Bailey at one point was going to be female and Destiny's sister, and the sisters would have been on bad terms before they reconcile at the end. Hank at one point was going to have an obsession for hot sauce. Why this didn't end up happening in the final film hasn't been revealed, but is believed by fans to be because Stanton is saving the Tank Gang's storyline for the third film.
OCTOPUS IN FINDY DORY MOVIE
While the Tank Gang do show up in the movie as part of the after-credits scene, they originally had a bigger role, where they would've encountered Dory, Marlin and Nemo after escaping the giant squid and they would have helped Nemo and Marlin to rescue Dory from the Institute. There was originally a "Parents School Day" sequence, in where Dory was going to start feeling nostalgic for her family. Originally Dory's parents would've suffered from short term memory loss, which would make Dory's line that her memory loss runs in the family as a fact, but this was changed as Andrew Stanton realized it could be frustrating to have all of Dory's family forget what each other said through the movie. In original versions of the movie, all of Dory's flashback sequences were part of one single scene which would've told all of her backstory at the beginning of the movie, but after a test screening, they decided to tell her backstory through flashbacks over the course of the movie.
The "Sleep-swimming" scene from the teaser was originally part of the movie and was much longer. They told Gabriela they didn't want to look back on this film in 50 years and have it be their Song of the South. Louie Psihoyos: After seeing Blackfish, they retooled the film so that the sea creatures now have the choice to leave that marine park. The ending of the film was rewritten after the creators saw the documentary Blackfish, which advocates against the treatment of animals in marine parks.