I am making a movie. Looking for all video game experts.

[minator]

So does anyone know if displaying games would get you into trouble?

Yes, he would need permission from the games' copyright holders to use footage of their work, just like as if he was selling a DVD full of clips of movies.

I'm not a copyright lawyer but I'm really not so sure on this, it could fall under fair usage since it's not a copy of the full game itself.  In any case the companies in question are hardly likely to care (unless it makes pots of money) and that's ultimately what really matters.

[minator]

But I could have sworn my teacher my freshmen year of highschool told me that some smart guy at Nasa was off by a number, and some launch made to mars, it missed it and nearly WASTED millions of dollars for no good reason... But I am not sure if it was announced to the public, but pretty much it would be the same thing as of now.... Just off by ONE number, and there goes the entire project....  

I didn't happen once, it's happened on several occasions!
metric-imperial conversions (or lack thereof) have caused a few failures.

A minus sign once took out a rocket!

...and it doesn't just happen to NASA:
http://www.around.com/ariane.html