Replicate (Morphling)
I'm not sure if it is really a bug or not, but when I swap positions with the illusion created by Replicate, the illusion disapear, so I can't swap more than once.
Illusory Orb (Puck) + Multicast (Ogre Magi)
When Illusory Orb triggers Multicast, after the first missile "dies", pressing the teleport button will not work and display "there is no orb". Also, if you press the teleport button before the first missile "dies", it will teleport the hero to the last casted missile position and not to the first.