There are a few bugs I let go in the current release (0.9.0). They are relatively minor things, and will be fixed soon. If you find a bug in gahtzee that's not already listed here, send an e-mail to firstname.lastname@example.org.
Not really a bug, but all you need is 3 of a kind to get a full house.
In some cases, the large straight (usually when you don't have a straight) will give you a large number of points (around 800). (Note: sometimes the numbers are smaller. If you encounter this bug, let me know what the numbers where on the dice.)