Mary Poppins is loosely based on a television series.
 Julie Andrews, who portrayed Poppins in the 1964 film, was approached to do a cameo (possibly as the Balloon Lady before the part was offered to Angela Lansbury) in the sequel but turned down the offer as she wanted it to be "Emily's show
 The part was written to be a cameo role for Julie Andrews who portrayed Mary Poppins in the original film, but she turned the role down as she felt her presence would unfairly take attention away from Emily Blunt

