Kirsten Dunst auditioned for the role of Abigail Williams. She impressed everyone and was asked back to several callbacks and even did a screen test, but the producers and director ultimately decided that she was too young.
When John Proctor and Elizabeth are having their private conversation towards the end of the movie, his teeth look normal. However once they return to judge and Rev. Hale, his teeth look rotted and decayed. When he his hanged (the same day) his teeth are normal again.
In the scene where John Proctor goes out into the pond, when the camera cuts back to the crowd onshore, an airplane condensation trail can clearly be seen in the sky.