1: When the iron golem gets stuck/attempts to teleport to you, he sometimes turns into a targetable enemy and usually poofs or instantly dies to your other minions/sources of damage.
2: When the iron golem gets FROZEN (i.e: frozen arrow, glacial spike) if he has a runeword aura, it stops working for the rest of the game, other item modifiers seem to still apply like lifesteal/chance to cast, etc.
Example: h ttps://streamable.com/1h4imo
3: When the iron golem gets Life Tapped, he takes an absurd amount of increased damage. A 7k life golem can die in under 3-4 hits this way.