Billowing cash, batman

Don't forget about when someone has a bag of cash,  which blows away in the wind (Miami Vice), or a manuscript UNBOUND with loose pages (Wonderboys) blows away. Or treasure sinks to the bottom of the ocean.

What the world needs is assets that are both heavy (to avoid being blown away) but lighter than air (to avoid sinking in the ocean). Duh!

Destroy!

Having watched 10s of Hollywood movies in the last 3 years, I have noticed something interesting. After using a set, it is customary to destroy it in the most gratuitous way, while filming it. This way you're making the most of your budget. In future, watch out for this, it's pretty frequent.

For instance, a bar brawl, a fire, a gun-laden mob hit on a building, or a building being knocked down.

It's a good money-saving tactic.