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When fiction deals with the history of some region, it may sometimes need Rose Tinted Narrative to get mainstream success in that region. In worse cases, Rose Tinted Narrative will be required for publication.
The Deep South in the first several decades of film got a lot of rose-tinting.
Also happens with other works that require the authorization of their subjects - authorized biographies, for instance.
Under The Hays Code, priests, ministers, and other religious authorities had to be portrayed respectfully without exception. Fittingly, one of the co-authors of the Code's actual text was a Jesuit Catholic priest - and while he acknowledged that not all "ministers of religion" were worthy of respect, mockery of any one of them would (supposedly) encourage sacrilegious attitudes.
Avoid the Dreaded G Rating. It's presumed that any work that can be seen without moral qualms by anyone, regardless of age, is not worth seeing by adults ("children will watch anything"). Since this would cut into profits by scaring off parts of the potential audience, it needs to be avoided.
Dawson Casting can sometimes be necessary for legal reasons. One example is the film adaptation of The Reader. Michael Kross legally couldn't shoot his sex scenes with Kate Winslet until he had turned 18. A very common example is to avoid Union regulations and/or actual laws in regards to youth actors.
555: Fictional phone numbers and addresses may need to avoid corresponding to ones in Real Life.
No Budget: When the creators are limited by budget constraints.
White Male Lead is usually employed because the entertainment industry feels (rightly or wrongly) that in order to appeal to whites, they need a white lead because white people won't relate to a minority.
Precision F-Strike shows up in many movies whose producers had to fight for "PG-13" ratings, since the MPAA's rules on profanity mean that a movie arbitrarily receives an "R" rating if it uses the word "fuck" more than once.