A filmmaker named David Ma posts behind-the-scenes videos explaining TV and movie hacks. For example, prop cigarettes have no tobacco. They look and burn like regular cigarettes, but they're made from herbs, so you don't hack up a lung.
And actors sip from empty Starbucks cups, because if they spill something on their costume, it would halt production, which costs money. There's also a special cutting tool that makes a burger look like someone took a bite out of it.