Irrelevant information does not improve the evaluation, rather it can obscure the stronger parts of responses. Often, adding irrelevant information leads the reader to believe that you either do not know the subject fully or that you are grasping at thoughts to come up with an answer. In either case, the information is not impressive if it is irrelevant. Putting down such information wastes your time. Organize around clearly stated central ideas.
Some responses are cursory because they are superficial.
By substantiating general responses with specific examples, you can clarify your response. If the question asks for examples, then the answer is incomplete without them. Be careful in using exemplars, however. Your preparation can be easily revealed if the examples that you use are incorrect. For instance, if you cannot recall an example relevant to the question, do not take an example from another area and draw an analogy.