Rupert Penrry-Jones also appeared in the series Black Sails that is a prequel of the Treasure island history
Elijah Wood spent two hours in makeup to achieve the look of Ben Gunn. That included makeup and a fake tan.
David Wilmot who plays William O'Brien in this goes on to play Israel Hands in Black Sails.
Eddie Izzard used Winston Churchill as inspiration, when transforming into the role of Long John Silver.
Silver's parrot Cap'n Flint is a greenwing macaw, one of the largest parrots, but typically quite gentle--fortunately, as the force of their bite is around 400 psi. The parrot's "voice" is provided by a human actor--macaws can talk, but they have much more croaky, hollow-sounding voices.