Situational Irony: Elsa
Elsa attempts to take the Holy Grail out of the Temple despite the Knight’s repeated warnings. The Knight tells her she will die if she takes it out of the Temple; she does die.
Situational Irony: “Panama Hat”
Indy actively seeks out “Panama Hat” despite the fact that he badly defeated him early on in Indy’s life.
Dramatic Irony: The Knight
Audiences know that the knight guarding the Holy Grail has drunk from the Grail, thus ensuring himself eternal life, before the characters in the film do.
Dramatic Irony: Elsa
Audiences know that Elsa is working for the Nazis before Indy and his father do.
Verbal Irony: Marcus
Marcus asks “Is there anyone here who speaks English? Or maybe even ancient Greek?.” This is sarcastic as very few - if any - people speak ancient Greek.