the Saab 7-series

althought i cannot completely forgive them for doing it with such cavalier abandon and thinking no one would notice, i actually prefer the Saab 9-3 to the BMW 7-series as derek shepard's car. what is it with replacing cars at random on shows? what ever happened to continuity? some examples of shows that do the same thing but irritate the shit out of me: The O.C., where Marissa's Ford Mustang randomly changes from a coupé to a convertible and back again; Smallville, where Lex Luthor drives a different car on set EVERY WEEK, and any Singaporean drama series involving an automobile accident, where--as an example--a Lexus LS430 mysteriously turns into an old Hyundai Sonata at the point of impact.