To get off the political tangent...
People in films having gargantuan homes despite having minimum wage jobs.
Actually, at least in America, that's not that uncommon. There seems to be this perception that you MUST own a home. At least before 2007, they were also seen as a great investment. It's more than a status symbol, it's... expected. Most of the people I work with were pretty shocked when I expressed little interest in ever buying or owning a home. I can certainly see the benefits and even the joy of owning a home, but at this time in my life, I have absolutely no desire to do so for various reasons.
So I don't think its an unrealistic movie cliche to see otherwise lower income or even people of any income living beyond their means vis a vis the home they own. Part of the American dream was that whole 'suburban two-cars, garage, home and a lawn'-thing and media reflects that, for better or worse.
What bugs me more than this is when people living in cities have gigantic and opulent apartments while working arguably shit-paying jobs (think
Friends). I find that much more annoyingly cliche than the house thing to be honest.