- Gray's boxers are much longer in the anime, and are usually always black, unlike the manga
- He is seen smoking in the first few chapters of the manga. This is not seen or mentioned in the anime.
- Hiro Mashima has admitted that he forgot how he named Gray.
- Gray stated that ever since he bears the mark of Fairy Tail, he had never lost to the same opponent twice.
- The necklace Gray wears was supposed to be Rave, but after bouncing around the idea of Gray being the 10th Rave Master among others, Mashima eventually rejected the idea.
- Gray was originally planned to become the Ice Dragon Slayer, but it was ultimately rejected. Around the Tenrou Island arc, Mashima toyed with the idea again before finally settling on Gray becoming the Ice Devil Slayer just before he started writing the Grand Magic Games.
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