* CreatorBacklash: Creator/GregoryPeck hated the film.
-->''Mackenna's Gold'' was a terrible western. Just wretched.
* ExecutiveMeddling: Originally planned to be shown in single lens Cinerama with reserved seat roadshow engagements, Columbia pulled the plug on that idea, and the film was drastically cut down immediately prior to its release, from nearly three hours (plus an intermission) to just over two hours.
* FakeNationality: Creator/OmarSharif (an Egyptian) and Creator/KeenanWynn (of Jewish-Irish background) as Mexicans; Creator/JulieNewmar (of Swedish-French descent), Ted Cassidy, and a few other obviously Caucasian actors as Apache Indians (hidden under layers of [[{{Brownface}} brown makeup]]).
* PayingTheirDues: The making of this movie was documented in a short film directed and written by a young film student named Creator/GeorgeLucas.
* WhatCouldHaveBeen: The film was originally meant to star Creator/ClintEastwood, but he was busy with ''Film/HangEmHigh''. Creator/{{Steve McQueen|Actor}} was also considered.
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