I'm with you on Thunderball's portrayal -- TPTB need to remember that T-Ball has a doctorate in physics. It actually makes him a more interesting character, rather than just Evil!StrongGuy #243.
But, IMHO, that's ContinuityFail rather than RaceFail -- and most likely b/c the last time the W-Crew were considered A or B-list baddies was...hmmm...the Roger Stern-era Avengers?
As for the Arab, well the 'hook nosed' bit is probably Hotz's call/mistake rather than Parker's...I can't really imagine the script specifying that level of facial detail in an ancillary character like one way or the other. I suppose the editor could/should have caught it as well, and asked Hotz to tone it down a bit.
That said, I'm inclined to cut Parker and Hotz both a certain amount of slack regarding the rest of the portrayal due to the fact that the Sultan of Brunei (and certain of his male relatives) have been guilty of some pretty skeevy stuff when it comes to the many women they've 'invited' to their abodes over the years. Google Shannon Marketic and/or Paula Bradbury for more details.
So, if dude was simply some Arab slave trafficker of unspecified origin, I think one could argue that he was standing in for all Arabs, and that could be seen as prmblematic. But since he is explicitly labeled as a nephew of the Sultan of Brunei, that seems less like stereotyping and more like...reasonable dramatic license a la a the Law & Order 'ripped from the headlines' approach.