So I was snooping around Youtube, reviving my childhood with Redwall, when I noticed something.
This is the opening that I've always seen on TV:
And then I came across this one:
https://www.youtube.com/watch?v=kKmkIpOrgUc
You'll notice Martin's voice over is different. The opening from the TV series always had him saying "I am that is, my sword shall wield for me!" in a bolder tone, but in the second video what he says actually follows the book: "I am that is, my sword will wield for me!" in a more mellow tone.
Nothing big, but it got me curious. I had never heard of the second version before.