There are several differences between the Book,Film,and TV Series, let's find out what they are.
Movie
-A doe from Sandleford named Violet is killed on the way to Watership Down,no one died getting to Watership Down and there were no does with them in the book. -Woundwort is not given a backstory
-Hawkbit,Buckthorn,Speedwell,Bluebell,Acorn,Silverweed and others don't appear in the film. -Vleflain is not created -Only one of Dandelion's stories are told, and it's not even told by him. -The Rabbits don't have secondary names -Blackavar is killed by Woundwort,in contrast to the novel,where he is never killed -Woundwort is described as ugly and blind,not described in the novel
TV Series
-Hawkbit is in,but is a rather grouchy rabbit instead of being slow and stupid,who is a good friend of Dandelion -Blackberry is female and the mate of Campion,she may have even had a crush on Hazel -Darkhaven is Woundwort's Origin -Hannah is a mouse who Hazel saved in the novel,but is turned into a main charcter as a friend of Kehaar -The rabbits meet Cowslip after getting to Watership Down -Spartina is a new mate for Bigwig,who never had one in the novel -Clover is Hawkbit's mate instead of Speedwell's -Kehaar is given a mate in Gluk -Primrose replaces Hyzenthlay as Hazel's mate -Vervain is now a cowardly sidekick to Woundwort -Darkhaven is not mentioned in the book or film -The Black Rabbit of Inle follows Campion constantly in season 3 -Skree is a replacement hawk for Kehaar in season 3 -Dandelion hardly tells stories and is more of a wisecracker -Silverweed sees visions almost just like Fiver -Magic is the demise of Woundwort and the Efrafans -The Watership Down rabbits make friends with a badger named Bark as well as some bats and rats -New characters include:Captain Broom,Primrose,Granite,Hickory,Marigold,Moss,Spartina,Gluk,Skree,Heather,Bark,bats,rats, Weasel,Hannah,Yona(in the book Yona is male,doesnt appear in the movie and is female in the TV Series),Hazel and Primrose's kittens,and much more -Bigwig is not a captain of the Owsla,but a captain under Hazel's lead -Tabitha is a female cat in replacement for Tab -Silverweed is taken by Woundwort and rescued by the Watership Down rabbits -The rabbits don't look very realistic as opposed to the film