Lily's mother, Jemima Puddle-Duck, Samuel Whiskers, and the citizens of a farm, and other side characters are the only characters that have never seen Nutkin.
In the books, Flopsy, Mopsy, and Cottontail are older than Peter. In this cartoon, Peter, Flopsy, and Mopsy are older than Cottontail.
Flopsy and Mopsy don't seem to have a close relationship with Peter.
A wagon, the Branch Breaker, and the go-kart are the only vehicles present in the cartoon.
Peter used to wear a red jacket which was replaced by his popular blue jacket.