In the episode, Lucy and Ricky are celebrating their 13th year anniversary. At the time of filming, Lucy and Desi had just celebrated their 13th anniversary.
When Lucy and Ricky are looking through their photo album, the pictures are from Lucille Ball and Desi Arnaz's personal collection except the picture of Fred and Ethel. Real pictures of a younger William Frawley and a younger Vivian Vance were combined.