Mary Poppins is one of those classic movies that has transcended generations. It doesn't matter that the movie came out all the way back in 1964. Walt Disney PicturesThe movie is just so iconic and fun that kids love it no matter when they were born. They are even making a sequel to it starring Emily Blunt and Lin Manuel-Miranda. Walt Disney PicturesBecause the original is such a classic, it's fun to imagine that Julie Andrews really has a flying umbrella and Dick Van Dyke really did love dancing on roof tops. The truth is, a lot of work went