Some of the notes from the BC cinematic section of the artbook:

• Good paladins always keep their armor shiny and polished.
• Don’t be fooled by her innocent appearance – blood elves are known to be extremely violent and unpredictable, especially when cut off from the sunwell’s arcane powers.
• Glowing Brightwood Staff: Binds when equipped – sells for 5 gold 70s 18c to vendors 
• These orcs are lazy and unstylish, so they often have mismatched vendor trash (gray) armor
• Gems spliced into flesh skin eventually grows over the foreign matter creating a protective coat of armor.
• Undead Warlock • the stench of the undead can be detected from over a mile away
• The ramp to the portal used to have hundreds of steps carved out of it – it has now been nearly completely worn away
• Illidan Stormrage resides in the Black Citadel, a massive fortress in Outland 
• After his defeat at the hands of Arthas Illidan retreated to Outland, where he broods atop his throne.