<P> Unfortunately for Brian, when his novel is released, it is universally panned by literary critics and does not sell a single copy . Brian laments that he sacrificed his core beliefs for nothing, but Lois intervenes because he helped ban cannabis (and she also points out how Stewie got to build a nice fort from all of Brian's unsold books). A distraught Quagmire arrives at the household and informs Peter that he is still looking for James and offers a reward of $50 . Peter nonchalantly takes the reward, admits that he killed him and slams his door before Quagmire has a chance to react . </P> <P> The episode was written by series writer Patrick Meighan in his second episode of the season, the first being "Road to Germany", and directed by former King of the Hill and The Oblongs director Julius Wu before the conclusion of the series' seventh production season . </P> <P> "420" has been noted for being the final appearance of the recurring character Kevin Swanson, the son of characters Joe and Bonnie Swanson . Since the fifth - season episode "Saving Private Brian", series creator Seth MacFarlane and other staff writers had planned on writing out the character . MacFarlane recalls not having ideas to write for the character . During the episode's production, the character of James the cat was originally colored white, but MacFarlane decided that it bear orange fur after he thought that white was a fairly dull color . The featured musical number, "A Bag o' Weed," was based on the Chitty Chitty Bang Bang song "Me Ol' Bamboo". </P> <P> In addition to the regular cast, voice actor Phil LaMarr and voice actor Kerrigan Mahan guest starred in the episode . Recurring guest voice actors Lori Alan, Chris Cox, actor Ralph Garman, writer Danny Smith, writer Alec Sulkin and writer John Viener also made minor appearances . </P>

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