What I Think Of When I Think Of Act III

So basically in Act III we see King Claudius's reaction to the play, Hamlet murdering Polonius, and Queen Gertrude's reaction to Hamlet telling her that Claudius murdered Hamlet Sr. So I feel like Claudius's reaction to the play was extremely dramatic and in the eyes of Hamlet made him extremely guilty. When Hamlet murdered Polonius I was shocked at how casually he just killed him and took his body away. Also, the way the Queen Gertrude responded to Hamlet telling her that King Claudius murder Hamlet Sr. made me think that maybe she didn't know anything about it to begin with which I previously thought she did.