Basil's introduction to the series differs from the book. In the show seemingly none of the Redwall Abbey knew who Basil was when he first arrives. In the book however, when Basil arrives at Redwall, it is revealed that he was an old friend to the Abbey.
In the book, when Cluny tries to infiltrate the Abbey using a plank, Constance simply kicks it off the wall, while in the TV series, she struggles to hold it up and Matthias helps her push it.