I will give you one for each to get you started.
When Hamlet is speaking with Rosencrantz and Guildenstern he misleads them to think that he is upset over the fact that he is not the new King. He says something about having bad dreams, but Guildenstern jumps on that and says, "Which dreams indeed are ambition; for the very substance of a ambitious is merely a shadow of a dream." Guildenstern's line may be a truth, but is NOT true for Hamlet right now.
As for guilt, Hamlet is constantly concerned over his mother's actions and wants her to feel guilty about this quick marriage to his uncle. Finally in Act Three he makes he feelings clear and they leave quite an impression on Gertrude. She replies to Hamlet, "Thou turn'st mine eyes into my very soul, And there I see such black and grained spots." She sees the guilt of her actions!
This play isn't really about the class system in any signifcant way, but the relationship between Hamlet and Ophelia is potentially troubled by the fact that Hamlet is a prince and has obligations to the state, and Ophelia is not a nobleman. Her father is a courtier, but not royal in any way. Leartes rightly points out to Ophelia that Hamlet's position "greatness weighed" must be taken into consideration because, "his will is not his own; For he himself is subject to his birth... for on his choice (of wife) depends the safety and health of the whole state."