Common denominators

How about a clue?

Fonda and Waterston both played Lincoln – did Frasier?

All works supposedly taken from previous manuscripts.

(Of the 3, only Eaters of the Dead is based on any real pre-existing work, and even there the connection is vague at best.)

Excellent!

They all had work with gypsies in the title?

The Gypsies
“Band of Gypsys”
“Gypsies, Tramps, and Thieves”

Yes! In Bedazzled. You got it. Try these:

Lily Tomlin
Rocky Marciano
Gloria Estefan

And since we’re not limited to people:

England
the Knights Templars
the former Soviet republic of Georgia

Hydrated silica is opal, which is the birthstone for October. Pensacola was hit by Hurricane Opal in 1995.

They all have red crosses on a white field.

Yes. After the my previous answer, I wanted another SDMB inside joke.

Is it awful that my first thought was wondering if Nancy Reagan has some connection to ovens?

Uh, they all go fast?

No idea.

I thought about adding “…so, buckeyes?” but decided against it.

Way funnier than the answer I’m looking for.

Already answered.

I figured the correct answer was “3”.

And the answer was… ?

Scroll back up, it’s there.

This is rapidly approaching the any-joke-isn’t-funny-if-you-have-to-explain-it stage.

I saw that you posted “Cite?”

Yes.

Correct, the flags of each bear the cross of St. George.

Sorry to be dense, but I’m totally not getting the joke. Could someone spoil the answer to Arcaro/Cessna/Edsel for me? Thanks.

I’d love to if I got it myself. But I don’t.