In the English version of Kingdom Hearts HD 2.5 ReMIX for the PS3, there was a bug that would cause the game to crash when you went into Limit Form during the first Xemnas fight and activated the first Reaction Command. View footage of this old glitch below:
(The testing begins at around
Also, if you didn't catch it, Square Enix has announced that they will be offering a Day One patch for North American and European players for Kingdom Hearts 1.5 + 2.5 ReMIX. It is stated that the patch is to resemble that of which was released in Japan.
Thanks to @Bizkit047 on Twitter for the tip!