The Joneses-
Opening Credits.
This movie is called Avatar. It is, as of 2013, the best selling movie of all time.
The first movie made and directed by Todd Phillips was a documentary of feature length, called "Hatred". His first movie with actors is called "Frat House".
The movie director called "take five" to his actors
Some of the actors that starred in the 2005 movie called "Walk the Line" are Joaquin Phoenix, Reese Witherspoon, Robert Patrick, Dallas Roberts, and many others.
The vehicle that transports the actors back to base in the movie "Eight Below" is a snowmobile.
step up in the streets
The Truman Show
It is called improvisation.
Yes, many times actors do get to keep some or all of their wardrobe from movie sets and also photo shoots. They get permission before taking anything,
Yes you can. All you have to do is find a place that is looking for actors/actresses and try-out.