In this episode, Woundworth and Bigwig are facing each other in a single combat. This also occurred in the original book and the movie. However, in this case Woundwort is the rabbit who walks away victorious, while in the original plot the battle ended with Woundwort fleeing from Bigwig.
It is revealed that Woundwort's father was named Hemlock.
Upon entering Redstone, Woundwort and Vervain adopt the names "Wheatstalk" and "Chaff" respectively.
The farmer's dog was previously called "Duster". But in this episode, the farmer calls him "Chester".
The rabbit in Campion's vision is Shale, who will make his first physical appearance in "Redstone Falls".
When Hazel and the others prepare to leave, they take turnips from the flayrah pile. But when they are outside, they are carrying carrots.
When the Watership Down rabbits are sleeping, Hawkbit and Fiver's heads are miscolored.
When Fiver is looking at Buttercup's food, his face has more dark brown fur then normal.
When Dandelion is organising Pipkin's animal friends, his fur is a darker brown then usual.
When interrogating Campion, Vervain is briefly seen walking on his hind legs.
In one scene in the caverns Hazel, Fiver & Hawkbit pass through a tunnel lined with some kind of crystals and some hanging sheath that looks like either glass or ice. It is unlikely that ice could form down there and glass would be impossible and the North downs aren't volcanic land, so the crystals can't be quartz or anything igneous; since Hawkbit smashed a sheath when sliding to a halt after a psychotically-induced dash the most logical solution is that the crystals are gypsum.
The scratch marks Woundwort makes on Bigwig's front leg disappears after he gets on the boat.
Woundwort is being voiced by John Hurt, the same man that was doing Hazel's voice in the Watership Down movie from 1978.
In the original book, Blackberry was a male rabbit.