* ActorAllusion: Maggie [=DuBois=] says she can speak French, Russian and Arabic. Creator/NatalieWood was of Russian descent (her real name is Natasha Gurdin) and spoke fluent Russian.
* TheCastShowoff: The film has an example that is perhaps too ''brief'' as we only hear the character of Maggie - who is [[ChekhovsSkill established as being fluent in Russian]] as Creator/NatalieWood was in real life - speaking ''one'' mere sentence in Russian while addressing and winning over the sinister Russian villagers.
* ContractualObligationProject: Creator/NatalieWood didn't want to be in the film, but Warner talked her into it. Wood was unhappy with her career and her personal life, having recently divorced from Robert Wagner in April 1962. Warner asked Creator/TonyCurtis if he would give a percentage of his film royalties to Wood, as an enticement, but Curtis refused. He said, "I couldn't give her anything to make her ''want'' to do the movie." Instead of more money, Warner promised Wood that if she completed ''The Great Race'', she could star in ''Inside Daisy Clover'', a role she greatly wished to have. Wood agreed, thinking that filming would be brief on Edwards' movie.
* DuelingWorks: The far more commercially and critically successful ''Film/ThoseMagnificentMenInTheirFlyingMachines'' had been released not a month prior by Fox, which hurt the film in both departments (though it still made over double its budget at the box office).
* EnforcedMethodActing: When Professor Fate uses the railroad rocket-car for his second stunt, depending on who you ask either Blake Edwards decided not to tell the extras just how large of a pyrotechnic load was packed in the engine, or he didn't realize it himself. When the crowd scatters, what you see is genuine shock and terror on the faces of the extras.
* HostilityOnTheSet: Creator/TonyCurtis and Creator/NatalieWood had previously costarred on twice ('King's Go Forth and ''Sex and the Single Girl'') and had a very acrimonious relationship. Part of the reason that Wood was unhappy on the film was that she felt she was being sexually harassed by both Curtis and Creator/JackLemmon.
* NonSingingVoice: Robin Ward sang "The Sweetheart Tree" instead of Creator/NatalieWood. Wood sang "My Country 'tis of Thee" herself earlier on...you can tell because she sounds off-key.
* ProductionPosse: Creator/BlakeEdwards, director and co-writer, apparently brought along a good number of the personnel he'd previously worked with on his [[Series/PeterGunn television]] [[Series/MrLucky shows]], most prominently Music/HenryMancini and Ross Martin.
* ThoseTwoActors: Creator/TonyCurtis and Creator/NatalieWood in their third (and final) film together, and Curtis and Creator/JackLemmon in their second of two. Although, ask anyone to name a Tony Curtis/Jack Lemmon film, they'll probably think of [[Film/SomeLikeItHot the other one]].
* WhatCouldHaveBeen: Creator/CharltonHeston was originally offered the role of The Great Leslie. He considered it a "funny script" but had to turn the part down when the production schedule for ''Film/TheAgonyAndTheEcstasy'' was delayed. Creator/BurtLancaster was announced at one stage.