A big part of the Kingdom Hearts series’ appeal is its attention to detail, and Kingdom Hearts III paid special attention to recreating certain scenes from Frozen. It seems that someone at Square Enix missed an important detail, though: the watermark that someone accidentally left in the middle of the “Let it Go” cutscene.
As eagle-eyed fans on Reddit have spotted, there’s one instant in the middle of Elsa’s big cutscene where watermarks appear. Look near Elsa’s arms at the right time, and you’ll see the word “arnold” written a few times across the screen. You’ll have to pause the video precisely, but you can hunt for the watermark yourself at around the 9:55 mark in this video (spoilers for the Frozen world in Kingdom Hearts III, obviously).
This isn’t someone sneaking their name into the game. It’s a watermark that appears in the animation program Maya if you try and render a project without an Arnold rendering license. According to Maya’s troubleshooting page, the watermark appears if “Maya cannot locate an Arnold license.”
Square Enix almost certainly has all of its licenses legally, but it seems like someone made a mistake and rendered this particular cutscene on a computer that didn’t have the Arnold license installed, or was otherwise having technical difficulties that prevented it from rendering properly. If you’re all done combing the game for Lucky Emblems, hunting for single-frame watermarks might be the next greatest challenge for fans of the game to try and spot.