Bernard says his wine is like "looking into the eye of a duck". David Lynch calls the best shots in his films "Eye of the Duck" moments in interviews, since the eye of a duck is perfectly placed and would look wrong if even slightly differently placed. Wittgenstein would use a drawing of a duck's head to make a point about ambiguity, since a duck's head and bill resembles a rabbit's head and ears.
Kevin Eldon played a police officer in "Hot Fuzz" with Martin Freeman, Nick Frost & Simon Pegg (who appears in season 3).
Cows have been known to save human lives occasionally, by intervening in dangerous situations.
Episode named after the John Steinbeck novel.
Tamsin Greig and Kevin Eldon were both in Green Wing.