Super Mario 64/NFR Cartridges

Super Mario 64 NFR Cartridges, with NFR standing for Not For Resale, were game cartridges were given to stores in order to display gameplay of the game before players buy them. These cartridges were not sold, and only standard cartridges were sold to the general public. NFR Cartridges for other games can have removed content or unavailable content exclusive to the main game, though the only difference in standard NFR Cartridges were the stickers on the cartridge labeling them as a NFR Cartridge.

NFR Cartridge Differences
According to some who have obtained a NFR Cartridge of Super Mario 64, there are several anomalies that can appear in NFR Cartridges. The most common anomaly is the unused Anti-Piracy Screen, likely due to NFR Cartridges only being made with the intent of being seen in stores. However, others have reported several anomalies becoming more common, mainly being unused assets such as the Motos or Dancing Flowers. It is not entirely understood why this occurs. Oddly, these anomalies do not appear to be reported when NFR Cartridges are still in stores.

Trivia

 * The first person to document the NFR Cartridge Differences was the creator of the Iceberg, specifically a user known as RedBees.