Mary Poppins enters the lives of the two children at the exact right moment, and not only cheers them up but also does magic in the lives of their parents and other adults.
The Wogglebug transforms from 2D in his book illustration to 3D when he enters the real world after being sent via a teleportation device. Just as Rocky, Bullwinkle, and their villains do when they are teleported from their cartoon into the real world.