In lines 75-78, romeo kills paris without understanding the significance of this action, though the audience does. cite another example of dramatic irony from the text.

I would say the opening of the play displays dramatic irony. When they are talking about the two households they say something a long the lines of "with their death bury their parents strife" which means only when Juliet and Romeo died did the to households stop fighting. I would say this is dramatic irony because the audience knows that something will happen but the characters do not.