What is the difference between these other than the slipcover?
https://www.blu-ray.com/movies/The-L...d-Blu-ray/760/
https://www.blu-ray.com/movies/The-L...Blu-ray/70722/
https://www.blu-ray.com/movies/The-L...Blu-ray/70723/
Also, did anyone get the 3D version? Is it worth it over the 2D? i.e. were the pop up effects worth it? I don't see this as a real 3D worthy movie but I could be wrong.