What evidence of wrongdoing or corruption is evident in opening speech Hamlet act 1 scene 2?

There is no mention of corruption or wrongdoing evident in opening speech of Act 1 Scene 2 in Shakespeare's Hamlet. In this scene, Claudius delivers a formal address at the Danish court, announcing his marriage to Queen Gertrude and the succession of Hamlet's uncle, Claudius to the throne after his elder brother King Hamlet mysteriously passed away