The Comedy Of Hamlet (Act I)

I have always loved watching these videos just because I thought they were funny and ironic, but looking at it the second time, I saw that it was really doing other things as well. I know it's hard to tell, but it sort of gets to the point and calls us out on everything we're always searching for as scholars, like when Claudius says his bit about foreshadowing. Why are we always searching for the things that are right in front of us in Shakespeare's plays? Is it because he causes us to search for them by making his plays so interesting to us? Are the minor characters really important to the plot, or are they just there to draw it out?