In act one two guards are doing the night watch and they see something suspicious that looks like the kings so they go and tell hamlet about it and he goes to the night watch later that night and he sees the same thing so he thinks it's his father trying to tell him to get revenge
In act 2 this if forcing on more on the ghost's message in my opinion. Polonius goes and sends his servant to go to pairs and spy on his son and the son charges the servant to find out Danes is living in pairs and where to find him
Act 3 the kind and Gertrude talk about Hamlet's actions with Rosencrantz they say they haven't been able to learn the cause of his actions. They send Polonius to go and spy on hamlet goes into the castle asking if committing suiduce is the answer to ending his pain
Long live the King! Dude did you see that?
Long live the king!!! saw what? woah that looks just like the king we have to tell hamelt
Go to pairs and spy on Laertes don't get caught!
Yes sir I can do that
Ophella and Guildensten following the king and queen into the castle