Glitch - seeing enemy units when they are out of your visibility.
When you see an enemy unit, you can select it, seeing all it's stats (hp, etc) if the unit goes out of visibility range, the unit still stays selected - showing you all the stats. You can put the unit into a bind (ctrl + #). The unit will be selected no mater where it is.
I know this is because there is no code stoping a unit from being un selected when it goes out of range or visibility.