Easter egg: Go to Special Features and highlight More and click up and enter. It shows a dumb clip.
Easter egg: Go to Special Features and then click Cut Scenes. Highlight "The Evil Council Loves Tacos" and click right and enter, it shows takes of Chosen One dancing to a song.
Answer: Some scenes/shots were taken from the old movie, while others were made specifically for this movie. Additionally, numerous shots were "composited" to place new characters in the old footage.