Three things to note:

1. According to this site, there was a DirecTV special of MK: "Home Mortal Kombat Special" Does anyone remember this? http://companies.jrank.org/pages/2779/Midway-Games-Inc.html

2. A BETA of MK:M for N64; this is 2 parts - http://www.youtube.com/watch?v=MVS5ZLtigtE

3. Rare interviews (most in English): http://www.youtube.com/watch?v=qhgZ8O9_Zf4 This guy has three more videos. More rarities (1 was mentioned earlier by someone else) can be found by searching "mortal kombat files" to find 7 foreign Mk video about the movie, most in English.

4. Remember the MovieCd version of Mortal Kombat where you could watch the movie on your Win 3x or 9x computer? Well, it's not so rare - there are 8 copies for sale on Amazon.com - http://www.amazon.com/gp/product/1574180525/ref=olp_product_details?ie=UTF8&me;=&seller;=