Back in the 50's and 60's, the television industry had little concern mixing their show content with commercial content. This has recently come back into vogue--it's now called "product placement".
As I noted previously, I'm watching Hogan on the DVD boxed set of the series my wife gave me as a Christmas present. It has a number of extras, including the following commercial with the cast IN CHARACTER welcoming Carol Channing into the barracks. It's time for dessert, and there's always room for Jell-O (there's even a laughtrack). This is very strange to watch, but you can find examples of this type of thing from the Andy Griffith Show, the Dick Van Dyke Show, and the Flintstones (Fred and Barney enjoy a Winston cigarette). Someone was nice enough to put the Hogan commercial on YouTube...
Remember, you can play along! The DVD box set is available on Amazon.