Greg got his license during the third season (The Wheeler Dealer). Marcia should've gotten her license the previous season, after they came back from Hawaii.
Greg: You're as funny as Lucille Ball.
Filmed on October 25, 1973
Guest star Herb Vigran is seen again in this episode since being one in the episode "54-40 and Fight" back in season 1.
After this episode, Barry Williams really did crash his car (a Porsche). He required several stitches and minor plastic surgery on his lower lip.
This is the first time that Kitty Karry-All is seen since season 2.
If you listen closely to the background dialogue as Greg drives the course, Bobby mocks Marcia and says "He's coming in too fast...!" Her reply is "Oh, be quiet!"
Beginning with this episode, Cindy removes her braids and lets her hair down (more or less) like her sisters wheras she still has her braids in the nine-square family grid as the beginning of this season all the way to the end.
Mike gets his final new convertible for the series - a 1974 Chevrolet Caprice Classic convertible with a black vinyl interior. Fans can tell the difference between this car and the previous model (a 1973 Chevrolet convertible) by the color of the interior), though car-spotter experts will also note the cars have different grilles and taillights.
This episode was obviously filmed on a cold day, as Greg is wearing a jean jacket (and the others are wearing coats and/or sweaters too).