While I was writing the tutorial I noticed a case where checking the end-if box would clear out some other property of the sprite (I can't remember which), or cause it not to be saved, so selecting another rule and then coming back left a field blank. If anyone hows how to reproduce this behavior or similar behavior (in the sprite definition rule editor or the plan rule editor), please let me know. I can't reproduce it regularly, but would like to fix it.
