The scene with Bob Hope looking at the tag on the USO Tour was actually with Jayne Mansfield.
The episode title is a play on the title of the movie "It's a Mad Mad Mad Mad World." In her 60 Minutes interview, Midge mentioned that she'd had a part in that movie. The movie featured cameos by dozens of the top comedians of the day.
The show doesn't mention which network the Gordon Ford show is on but when Midge goes to work she goes to 30 Rockefeller Plaza which means it's an NBC show.