Putt-Putt's radio doesn't do much with the plot in most cases, maybe at the start of a game. One major exception is in "Putt-Putt Goes to the Moon." In the CD-ROM version, it gives more details from Earth about Putt-Putt accidentally being shot to the moon. Even Baby Beep from "Putt-Putt Joins the Parade" gets a word in! I am surprised the Cartown radio station can be accessed on the moon! (The radio doesn't work in the demo version.)
I have also included the unused news report about Mr. Firebird's criminal suit, which can be found in the game's data files but never made it into the final cut.