Billing
A copy of the lobby card atop this site shows Billing as:
George Peppard Dean Martin Jean Simmons, i
s this true, I thought Dean Martin would have gotten first billing.
Maybe they went by who had the cutest hair.
shareMartin is top billed in the opening credits.
share(aka ecarle.)
Martin is top billed in the opening credits.
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And second in the poster.
This was done quite a bit, particularly in the sixties, it seems.
Example: for the poster of "The Man Who Shot Liberty Valance," James Stewart is listed above John Wayne(which is alphabetical, but Wayne was a bigger star by then -- Wayne got paid $750,000 for this movie; Stewart got paid $350,000.) But as the movie opens, John Wayne's name comes first, then Stewart's.
For The Great Race, Jack Lemmon gets first billing in the movie credits, but I think Tony Curtis got top billing on posters -- which was lucky for Curtis, he was starting to fade and Lemmon was on full ascent by then.