Castle of King Lucius
None of the dynamite in the starting board's arsenal harms you, as each one takes away 5 not from the health counter but from energy, which, despite the official ZZT documentation's claims, is not a valid counter to take from (or give to).
Similarly, on the game's second board, one of the Oracle's rewards for completing the test is 50 health, but instead, the code runs #give energy 50, which, for the aforementioned reason, does nothing.
(Report entered by Dr. Dos, original report by The Green Herring)
The final board of the game only checks for a flag (triggered by picking up an object elsewhere in the game) once instead of checking constantly by using #restart, making the game unwinnable if you enter it without that flag set.
(Report entered by Dr. Dos, original report by Pogesoft)