Greg says he is 14 and Marcia says she is 13. In reality, Barry Williams would have turned 16 and Maureen McCormick 14 on the date of initial airing.
The Brady phone number, as both Mike and Carol dial at the restaurant, appears to be 222-1116.
The made-up character Mike describes as "Charlie Hoffman", is a reference to writer Charles Hoffman, a sitcom writer, as well as a story editor/writer for the series.