Mary Poppins

 was something the Eleventh Doctor wondered — in the midst of a discussion about his fitness as a babysitter — if the twelve-and-a-half-year-old Kazran Sardick had seen. The Doctor stopped himself before fully comparing himself to Mary Poppins, saying that the analogy would have been "rubbish". (TV: A Christmas Carol)

When the Eleventh Doctor gathered magician props from the TARDIS, he placed them all in a large carpet bag which was bigger on the inside than the outside, saying he was glad he got it back from Mary Poppins. (PROSE: Magic of the Angels)

Andy Hansen was familiar with Mary Poppins and said if she tried flying in gale storms that were going on in 2015 she would end up in Norway. (PROSE: The Beast of Stalingrad)

Behind the scenes

 * Though the Doctor never specifically called Mary Poppins a film, a common sense reading of the scene would indicate he was talking about the film — largely because of the line, "Have you ever seen Mary Poppins?"