When Emilia and William are sitting in the park, William says "If you go to Collegiate, you can go to Harvard," Emilia responds "Harvard sucks." Natalie Portman, who plays Emilia, attended Harvard.
William's drawing from the middle of the movie is a different one from the one showed at the end of the movie. You can clearly see that drawn William on the first drawing is more sad than the William in the other drawing.
When snapping a picture of the newborn baby a flash can clearly be seen in the image, though no external flash is visible nor the internal flash from the Nikon camera.