1. At the start and the end of Raphael's description of Utopia, the narrator says that what he is most dubious about is the abolition of private property. At the end, he says that the reason is that it deprives a state of magnificence.
2. The essence of Utopia is not really communism, but the restriction on what can be consumed. Since, for example, everybody wears simple clothing of one pattern and color, nobody is tempted to steal anybody else's clothing or to take too much for himself from the warehouse. It follows that what goods are permitted are in overabundance and nobody wants to steal. One assumption is that if luxuries were not produced, wealth would be great enough for an overabundance of necessities even if everyone worked only six hours a day.
3. Utopia is a reformed monastery, with monks who marry and devote themselves to happiness and self-cultivation rather than prayer and worship.
4. The Republic starts with the City of Pigs, which Socrates says is ideal, but Glaucon complains that they have no luxuries there. Utopia is the City of Pigs fleshed out (no pun intended). The Republic's second city, the Callipolis (Beautiful City) has luxuries, but is a feverish, diseased city.
5. Utopia, like the City of Pigs but unlike the Callipolis, has no Guardian class. The philosophers are not kings there. It is a democracy. In a sense, everybody is a philosopher, though.
6. Gallipoli was called Callipolis in ancient times.
7. In Book II More makes the argument that if the natives are underutilizing a country it is just to drive them out to make better use of the land.