Bingo.
They all (I think; I’ve never read Anansi Boys) feature spiders as a central plot point.
Ding! Well done. 
Yes. Mine, too! Try these (and it’s more specific than “American actors”):
Bob Hope
Halle Berry
Paul Newman
All from Cleveland.
I didn’t know anything about their heights, but yes- Tom Landry, Roald Dahl, George McGovern, Gene Roddenberry & Jimmy Stewart were all Allied pilots during the Second World War.
Close; all were raised in the area. Newman was born in the suburb of Shaker Heights; Hope moved here from England when he was 8, IIRC. How about:
Ross Perot
George H.W. Bush
Bill Clinton
John McCain
Barack Obama
(Other than the obvious, “presidential candidates”).
And not Inigo Montoya.
All left-handed?
All of their fathers were dead when they sought the presidency?
Close,a woman tried to kill all 3 of them,though MLKs would be assassin used a knife.
Correct!
How about these:
Oberlin College
Gryffindor House
Kingdom of Spain
Colors are (some form of) red and (some form of) gold.
Oooh, you’re good! Correct.
Uh, they all have moustaches?
I’m still brooding about this one. Should we infer that there’s some trick involved in your only giving surnames? (Though I guess Lewis could be a first name as well.) (Carl) Lewis and (Jesse) Owens are both Olympic runners … should I be looking for a Barker who was as well?
Victory
Constitution
Mikasa
Yes!
Hmmm… Ernie Kovacs, Jose Ferrer & Mike Schmidt DID all have mustaches at one time or another, so you aren’t wrong.
But the common link I had in mind involved their last names.
How about:
seals
rhinos
cattle
And, inspired by astorian’s three above:
Ernie Kovacs
Jose Ferrer
AA Milne