1. Windows 8 build 7989 has an "IE10 mode" that isn't even mentioned on BetaWiki.
2. When switching users, Windows 8 build 7989 may have DWM issues on the first user account that was in use before switching to the second user account, resulting in Aero being disabled. This can be fixed by ending the dwm.exe process in Windows Task Manager.
3. If you move a tile on the Start screen far enough from where it previously was, Windows Explorer may crash.
4. Windows Explorer may crash while using a Metro app.
5. The Metro Control Panel has a few typos and grammatical errors in the buttons on the left hand side, such as "lanugage".