Hitchiker's Guide to the Galaxy Movie Casting Question!

[FlashHarry]

Ok, according to IMDB, the cast is as follows:

Warwick Davis • Marvin

Mos Def • Ford Prefect

Zooey Deschanel • Trillian

Martin Freeman • Arthur Dent

Bill Nighy • Slartibartfast
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Mos Def as Ford Prefect??? Say it ain't so!

Also, the director, Garth Jennings, hasn't directed before. His only previous credit is as "title designer" for Da Ali G Show. Man, I hope they don't f*ck this up!