Much like Felix D'eer from the first film, Barnabas is a new character created for the movie who wasn't in any of Beatrix Potter's original stories nor any previous adaptations.
This marks the final appearance of the 1967 MPAA logo in the end credits for any feature-length film.
Originally releasing on 3 April 2020, the COVID-19 pandemic delayed it to August 2020 and eventually 11 June 2021.
When Bea is talking to the executives regarding future books, they talk about the rabbits driving boats, motorbikes and planes, which were three of the vehicles Peter and Thomas McGregor used to get to Windermere in the first film.