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In the Japanese dub of the game, during the December 4th visit to the hospital to question Taro Namatame, he says the line: Spoiler:"Then… little by little, the image came into sharper focus." After the end of this line, you can very faintly hear a click followed by what sounds like the rustling of paper. This audio appears to be Namatame's voice actor Yasuhiro Roppongi turning the pages of his script after finishing his line read, and was accidentally left in the final game.
Persona 4 Golden Japanese dub (page flip can be faintly heard after the end of this line of dialogue):
https://youtu.be/89oDXHZVt5c#t=2853
LP Archive Persona 4 Golden script:
https://lparchive.org/Persona-4-Golden/Update%2099/
https://youtu.be/89oDXHZVt5c#t=2853
LP Archive Persona 4 Golden script:
https://lparchive.org/Persona-4-Golden/Update%2099/
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The Japanase and Korean versions of the game feature interviews with the main character's voice actors. This was completely removed from the game's western release, rather than being redone with the English voice actors, although data file remnants of it can still be found within the game's code.
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There is a Persona 3 calender on the wall in the main character's bedroom.
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The story that Adachi reads to Nanako about a lonely pink alligator is a reference to the story Akinari Kamiki from Persona 3 writes about.
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Both Chie and Teddie's voice actors (Tracey Rooney and Dave Wittenberg respectively) were unable to reprise their roles. They were replaced with the "Persona 4: The Animation" actors, Erin Fitzgerald and Sam Riegel.
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In the cutscene for the Ski Trip, if you look a Rise's jacket, you'll see "Lovers '06". This is a reference to Rise's Arcana, "The Lovers", which is the 6th Arcana (VI).
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