The American edition came with a sticker on the front advertising 48-hour Xbox Live membership, and most likely also a sticker on the back stating that the disc was made in Mexico.
The disc included with Resident Evil 5 (Xbox 360 Elite Limited Edition) has slightly different alignement of the copyright text going around the disc. Perhaps this disc was also included with regular editions of the game.
1. Front
2. Back
3. Disc