Two of them were already said but I'll repeat them.
1) Night Elf dancer in the top right of the cantina in the Hyperion.
2) On "Piercing The Shroud," where your reinforcements arrive, if you go all the way north then you'll find a Murloc Marine.
3) If a Battlecruiser engages into battle while your screen is off of it, the unit goes, "it's a trap!" to alert you it's in combat.
1) Night Elf dancer in the top right of the cantina in the Hyperion.
2) On "Piercing The Shroud," where your reinforcements arrive, if you go all the way north then you'll find a Murloc Marine.
3) If a Battlecruiser engages into battle while your screen is off of it, the unit goes, "it's a trap!" to alert you it's in combat.