Bill Potts said to the Twelfth Doctor he should watch Doctor Strange, right after she used the term "astral projection".
Both Bill and Masie Holland thought it was good. (PROSE: The Shining Man)
Upon escaping the Dreamspace, Bill noted she had an astral form, like on Doctor Strange. (COMIC: The Soul Garden)
Behind the scenes Edit
Doctor Strange was a film based on the character of the same name released by Marvel Studios in 2016. Benedict Cumberbatch plays the titular hero.
However, no story has made a connection between the character and the movie. In fact, neither The Shining Man nor The Soul Garden explicitly confirm that Doctor Strange is a film.