The trivia items below may give away important plot points.
The end of the movie is considerably more grim than the one in the book. This is because Director Martin Rosen was presented the story in its original manuscript version, before publishers convinced Richard Adams to soften his ending. Snitter's owner is alive in the book, and saves him and Rowf from the military after a fishing boat picks them up. The monkey in the isolation chamber is also saved in the book.
Snitter's shout to the vulture ("I hope you make sure we're properly dead before you start, old rip-beak!") is sampled in the industrial band Skinny Puppy's song/single "Testure." Both the song-- whose name combines "Test" and "Torture"-- and music video equates medical experimentation on live animals as torture.