“Casablanca” great partly due to the great diversity of talent behind it.
If you watch the “making of” documentary on the Casablanca DVD, you’ll see how many different sorts of people contributed to it, especially to the writing of it. I think it’s quite possible the interactions of this wide variety of talent played a huge role in making Casablanca one of the great movies.
Another ProxPattern that played a role is allowing some uncertainty. They talk about not knowing how the film would end, up until very near the end of the shooting. This allowing of tension throughout the making of it I think also contributed to the special quality of the film.
Variety People 
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