Milk-based products cause diarrhea or other digestive problems as rabbits do not have large enough amounts of lactase, which breaks down lactose in milk.
Large amounts of salt can obviously produce excessive thirst, urination and sodium poisoning in rabbits, as is the case with most pets. There is a massively long list of garden plants and weeds that are poisonous to rabbits and when time permits we will link a separate page here with photographs of those plants/weeds.