What are the similarities (in act 1 scene 2) after Claudius and the court leave, and act 1 scene 4 after the ghost leave?
Hamlet has the more complete thought process in his soliloquy (1.1.133-165). Here, he is mourning the loss of his father, ("So excellent a king") the treachery of his mother ("frailty, thy name is woman!"), and the unfitness of his uncle to be king ("My father's brother, but no more like my father/Than I to Hercules.")
Marcellus has the same sentiment but expresses it much more succienctly: "Something is rotten in the state of Denmark" (1.4.100)