Oftentimes, they would slide the pizza into specialty paper sacks with a piece of cardboard on the bottom and staple the end shut. They still do it this way at Duane's House of Pizza here in Fargo/Moorhead (DAMN good pizza!).
Look at how desperate he is to curry favor with his gawky shrew of a wife. His proud smile fading abruptly as she begins to stuff her face right in front of him. The jaunty chorus cannot hide the sweaty, anxious charade that is this man's daily existence.