Eels and escalators involved lots of house interpretation, but that's because they game doesn't feel like much effort went into making it unambiguous. Can't even think of any specific examples, but when in doubt on how cards interacted or what they do or whether they can be held for later, we generally just went with whatever seemed like it would be silly without much regards to balance or fairness. I think it took a couple games until we actually had someone win instead of just everyone dying.