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I think that many of these tricks were discovered a long time ago, they just weren't used for a while.
Here's an interesting link with a list of bugs: http://blackknights.narod.ru/h3_bugs.htm
Note the date of the entries (1999 - 2000). For example, it describes a bug with the earthquake spell, which was used many years later in Bug-Race (and, I think, in Qin the Suprime).
There was also this bug with Sacrifice: In the original Heroes III, the game let you cast Sacrifice on enemy stacks. [posted 10/25/1999]
In general, for a game that's 19 years old, all these discoveries are understandable.