<Li> Maria Thayer as Wyoma Braden: The sex - hungry wife of Darald . </Li> <Li> Paul Rudd as Chuck / Kunu: An air - headed surfing instructor who is 44 years of age by his own estimate . </Li> <Li> Jason Bateman as Animal Instincts Detective: A character on Sarah Marshall's latest show, Animal Instincts . </Li> <Li> William Baldwin as Himself / Det . Hunter Rush: In the film's universe, Baldwin is the "hard - to - love" co-star on Sarah's show . He is referred to as "Billy Baldwin" and Peter briefly suspects him of having an affair with Sarah . </Li>

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