The poem Mirror by Sylvia Plath (beautifully) employs allegory, personification, and metaphors. But what can we infer from the title? The title mirror naturally brings to mind ideas of reflection. This is the purpose of a mirror: to reflect. The best answer regarding what we can infer from the title is that the poem may be about self-reflection.
Dr. Lanyon is an intelligent, respectable lawyer who is suspicious the "Mr. Hyde" is threatening or bullying Dr. Jekyll into giving him property and leaving money for him in his will. Because Dr. Lanyon is an intelligent man, he always looks for a logical, practical answer, which is why he does not wonder is Hyde and Jekyll are the same person.
I think that could be about action is more significant than talk