There are some bugs related to the tower, such as the fact that units that die inside it cannot be resurrected using necromancy or resurrection spells.
Added 2 minutes later
Another observation... I'm playing as Inferno, with a Wizard. I was looking at what starting units are given and what it depends on. The Wizard always gets a Succubus unit, but the melee unit depends on... the hero's gender. Male heroes get Berserkers, female heroes get Dogs... very subtle humor, don't you think? :)))