Minecraft wiki entry for Update_LWJGL_(Legacy), associated text: With 2.8.1, on most 64 bit computers, the lwjgl64.dll update will cause a black screen crash. You can revert to the backup version you have saved if needed.
Again on several 64 bit computers, the OpenAL64.dll update can cause a sound glitch that makes bursting sounds. Keep a backup in case you need to rollback.
Version 2.8.5 generally breaks shift-clicking; 2.8.4 and 2.9.0 do not. You can change the url in your browser to access 2.8.4 or 2.9.0 rather than 2.8.5.
LWJGL 2.8.5 has a bug which sends a false signal that the user released all currently pressed keyboard keys when a mouse button is pressed. That means that your building will be significantly slower. Do not update to this version if this bothers you.
This bug seems to be fixed when playing in fullscreen mode (Default F11), or updating to LWJGL 2.9.0.