when jonas is announced the giver the head council gives him his job they tell the whole community about when he was a 5 he wedged his finger in his door. and for the elder to do that its singaling out and thats against the rules so its also a aha moment.
when jonus is given the memory of snow he finds out that there are other things than what is just in his community so that tells us that the have climate
when jonas is given the memory of war he is very scared because he thinks that their is no fighting and killing and that every where is peaceful
The giver gives jonas the memory of a rainbow which is surprising which tells you that they have climate control.
when the giver gives jonas the memory of a sunburn that also tells you that they have climate control because you get sun burn when your in the sun but if there is no sun then there cant be sun burns.
when jonus is given the memory of snow he is also given the memory of sledding and hills which tells you that they dont have hills