What Is the Difference between EBITDA and Cash Flow from Operations?

I just picked up the Pershing Square Value and Philanthropy Challenge (held on April 24, 2013) where I left off months ago.  It's not the only catching up I have to do, but here is why I am sharing this with you.

At 01:16:00, Bill Ackman asks a seemingly simple question that throws the guys presenting Hertz (HTZ) off balance.

What's the difference between…