If you like your job - or if you just like the money you get from doing your job
- you don't openly badmouth your workplace or your work environment in front of your Target Audience
The same applies to actors, directors, producers - everyone involved in a production down to the backstage workers (if they want to be hired for another production).
Rampant (for good reason) in DVD Bonus Content
and interviews is the fact that almost every person involved talks about what a great production it was, how they all got along great, and how this production is the greatest they have ever worked on. The job doesn't end when the director yells "cut!" - famous people involved in large productions with millions of dollars at stake can't go right home and tell their family and friends what a terrible work environment they are in, and how much they hate their (equally famous) boss and coworkers.
In short, whenever you see someone going on and on and on about how great the production/actors/everything is, they're selling the show regardless if they really like it or not. It's practically required in their contract, so it's ubiquitous in Hollywood and all related industries.
The truth can come out later in a person's Compromising Memoirs
(which may even reignite interest in said production!), but when the production is released, you want to get people excited about it to sell tickets/copies, and that's easier if everyone thinks you had fun making the production.
Like they say: Money talks, and when it talks, it doesn't tell the truth, it says what it's paid to say. And this is just one such example.
Notable Instances and Aversions Of This Trope:
- Hilarious Outtakes never show the director or actors getting actually angry about a scene that isn't working, or visibly frustrated with a fellow actor who keeps flubbing a line, though you know it must happen. Even Orson Welles' notably profane commercial outtakes don't disparage the product: only the quality of the writing.
- Part of the movie Galaxy Quest was how the actors had to continue to sell the show despite how they actually felt about it.
: You WILL go out there. Sir Alexander Dane
: I won't and nothing you say will make me. Jason Nesmith
: The show must go on
. Sir Alexander Dane
: ...Damn you.
- Megan Fox notoriously failed to do this and openly compared Michael Bay to Adolf Hitler, single-handedly torpedoing her career almost overnight (turns out, however, that it was actually Transformers producer Steven Spielberg who was personally offended, and not Bay himself. Not really surprising, however, as Spielberg is Jewish and, in fact, one of the biggest films of his career was a film about a German man who saved several Jews from the Nazi death camps by employing them to work in his factories, Schindler's List.
- Likewise Katherine Heigl got a lot of publicity for a Variety interview where she slammed Knocked Up, her break-out movie, as stereotypically sexist. She may have had a point, but many viewed it as an ungrateful betrayal, and the string of (arguably more stereotypical, and certainly much more mediocre) Romantic Comedies she made after it caused the Hollywood Hype Machine to turn against her.
- Bill Cosby famously told people not to see Leonard Part 6, saying it was a terrible movie. That, and the flop of Ghost Dad probably ensured he'd never have a major film career.
- When Paul Newman learned that a 1966 re-release of his first film, 1954's The Silver Palace was planned, so as to cash in on his new fame, he took out full-page newspaper ads apologizing for it.
- Robert Pattinson is quite vocal about how much he loathes Twilight, Stephanie Meyer, and the fans. It's made him hugely popular with the Hatedom.
- In this interview about the Doctor Who TVM "The TV Movie", Paul McGann and Daphne Ashbrook have nothing but nice things to say about almost everything except Eric Roberts, who was apparently standoffish, rude (making personal remarks about McGann being "effeminate"), and sometimes "amazingly bad".
Troper Bob: Wow, this was the greatest editing experience I've ever had. I really hope you enjoy this page.
Troper Alice: [Teary-eyed] I've never edited with a better group of editors!