Agrippas, the Roman general, asked Rabban Gamliel (paraphrase): Your God is a jealous God, but people are only jealous of those who are in real competition, so how can He be jealous of idols, which are fundamentally nothing? Plus, an example of a man who takes a second wife, and when that will make the first wife feel bad (in analogy to God vs. idolatry). Also, a challenge from people who are seemingly healed by idols. Plus, the perfect timing of suffering that can then confuse bystanders. Also, a focus on wine-making and taking the juice out of the grape - when does it become wine? (for halakhic concerns). Plus, draining the grapes and the implications as compared to juice flowing easily.