I noticed a motif with the Castle Chapel in Hollow Bastion with the numbers 12 and 8 whilst playing KH1FM. The sun image on the floor in the first picture has 12 rays. In the second picture, the keyhole-shaped light on the ceiling has 8 rays sticking out (same with the small suns on the bottom). There are 8 windows on each side of the circle part of the castle chapel (30 windows in the whole room in total)
Also, just another small detail, we have Ansem’s boss fight (the one where he turns into a ship) which has 8 phases in total. I think I saw a bit more of the 8-12 motif in some places, but I can’t really recall at the moment (and I could just have imagined it.)
At the end of the day, I’m pretty sure this means basically nothing for the plot of KH, but it‘s an interesting detail nonetheless.
P.S. In KH1FM at least, two of the scenes with Riku that occur in this room feature the keyhole-shaped light on the ceiling. The first instance of this being the cutscene where Maleficent warns Riku about relying too heavily on the power of darkness (I believe it pans from the light to Riku), and the second being when Ansem convinces Riku to accept the darkness (it pans from Riku to the light.)