Low Leopard Quality Assurance
This is a minor issue, but I think it shows well that Apple released Leopard way too early.
This is what you see when you hover over a dock item:
This is what you see when you open a stack as a ‘grid’:
See how the little triangle is a different color?
Big deal you might say. And that would be true if this were for example Windows. But personally I find this very sloppy work.
QA should have caught this. They were probably too busy finding iPhone bugs though.