That and the gradients, the look of the graphite buttons, the folders, the log-out button where Spotlight ought to be (there's no launcher bar equivalent that could be themed to look like Spotlight?), the spacing on the dock, the theming on the dock, the glowy ball, the spacing of the scroll bar on the Finder, the unnecessary Finder chrome (for people who don't know, all side and bottom chrome on OS X Leopard is 1px unless otherwise specified, and I don't understand why some developers are stupid enough to re-add the chrome Apple did away with)...
It's not worth it to go on. It irritates me so much that people would make an attempt like this in the first place. Every small detail irks me.
People who are educated in micro typography (The field of Graphic Design distinguised between macro and micro typography), see this difference instantly and everywhere. It's like reading: onec learned you automatically process whe you see letters.