We learn that Fred's birthday is Feb 2nd; Groundhog Day. This is verified in the golf course scene when Fred asks Barney if he knows of any reason why "today is a special day" and Barney's reply is "Uhm, it's Groundhog's Day?"
This is the first time the Flintstones are shown to have a wall mounted telephone.
ABC Originally Broadcast This Episode In Black And White
This appears to be a previously unaired episode made before Wilma's pregnancy, with Pebbles neither seen nor mentioned. The previous year's 1962 copyright date on the end credits pretty much confirms this.