Bugs I encountered in DP4 are still present in the GM.
eg every few boots the volume control is dimmed and audio not working, even rarer the wifi is likewise not functioning, the quirky flicker/colour tint change during the final stages of the boot screen, the dock occasionally spontaneously un-arranging icons that have been rearranged, Safari getting confused about UI elements that have been disabled/enabled in fullscreen mode (eg turn off the toolbar in fullscreen, revert to normal screen it is sometimes back otherwise turn it back on, but exit and reopen Safari and the toolbar is missing (an even more annoying glitch now that GM has removed the toolbar option from View menu, so not only can only hide it via right-clicking the title/toolbar area but the shortcut key is lost)), etc.
I am still very horrified they did not add in a UI widget that indicates scrollable content, even if it is nothing more than a tiny mostly-transparent arrow or dots. With no scrollbar (by default) there is no way to know that there is more content to see, so why would you necessarily scroll over it? Admittedly I occasionally have that problem on the iPhone too - it was only six months ago I realised Safari's address bar history list can be swiped over to reveal more history (though latest iOS does make bottom option only half appear so now it's obvious that there is more below, but that's just a work-around for a bad UI convention). The new dialog when Lion first boots is a perfect example of that - craps on about how the scrolling is upside down (eg we bagged MS because they didn't understand different between touch interface and PC interface, but now we've gone and shoved touch conventions onto PC interface ourselves), but doesn't actually say to "make sure you do a scroll on this actual pane because there is more content hidden below including the button you need to proceed further". Very odd. Alternatively, that scrollbars (again by default) do flash up for half a second when a dialog first appears could be tweaked so the fade process is much slower, saw 5 or more seconds, so is there for longer - or perhaps only fade to 20% opacity so they are still slightly visible...? Anyways, off topic.