This is the only time that all nine original cast members of The Brady Bunch (1969) reunited in a Brady special. There was always at least one hold-out in every other Brady reunion.
In a 2007 interview with the Television Academy Foundation, Lloyd J. Schwartz said that Mike Lookinland's mother played the organ in the wedding scene.
Robbie Rist declined to reprise his role as Cousin Oliver for the special.
Maureen McCormick failed to appear on the set one day due to having overdosed on cocaine. Lloyd Schwartz then enacted strict measures, which included taking away her car, to help her get through the rest of the filming.
Robert Reed initially declined to reprise his role, due to his continuing disillusionment with the franchise. However, when the producers replied that they would recast the role, Robert immediately recanted, because he couldn't stomach the idea of another actor walking his TV daughters down the aisle for their wedding.