There is a small blooper - the dial on the pay phone disappears.
This episode is of Fred's 35th birthday, and we learn his birthday is Groundhog Day, February 2nd.
The show talks about Little Old Ladies from Pasadenarock, and it was made in 1962. However, Jan & Dean didn't release the song "Little Old Lady from Pasadena" until 1964.
This episode was recorded on 8-10-62.
While this episode was recorded much earlier in the season, before the 'Giving Birth' arc, it was aired on ABC as the spring 1963 season finale- and usually aired in similar order in syndication. That's why there's no sign of Pebbles, even though numerous episodes centering around her birth and infancy aired prior to this episode.