In an Archive of American Television interview, Jason Alexander said that the day after the movie aired, he received a bouquet of flowers and a note that read "Dear Jason. Now I know how to play the role. You were terrific. Love Dick Van Dyke."
Tyne Daly was uncomfortable lip-synching to a prerecorded track, so she was allowed to perform her songs live.
Tyne Daly who played Mae Peterson said in an interview that her song "A Mother Doesn't Matter Anymore" (added for the TV movie) was written for the original 1960 Production, but it was cut well before the premiere since Kay Medford (the original Mae) couldn't sing. It was put back in to give Tyne a song (and probably to pad out the run time)
The first adaptation to include the title song as part of the story (a group of teenage girls sing it near the beginning as a farewell to Conrad Birdie). The song is not part of the original Broadway score and was added for the 1963 film. In that version, Ann-Margret sang the song as a prelude and reprised it as the film ended.
Three songs were added for this version not included in any previous one. They include "Let's Settle Down", sung by Rosie to Albert, "A Mother Doesn't Matter Anymore", Mae Peterson's admonishment to her son, and "A Giant Step", a love song for Albert to Rosie.