THE MERRY MEN

Exaggeration
To enlarge, increase, or represent something beyond normal bounds so that it becomes ridiculous and its faults can be seen.
Incongruity
To present things that are out of place or are absurd in relation to its surroundings.
Reversal
To present the opposite of the normal order (e.g., the order of events, hierarchical order).
Parody
To imitate the techniques and/or style of some person, place, or thing.

The Merry Men scene shows exaggeration by dancing and singing, when the men are supposed to be tough! Also, it shows incongruity by having the bushes move and the men moving in the background.
Robinhood is a parody in this scene by singing and dancing to the princess, when he usually is swift.
The princess fight scene demonstrates reversal by being the tough one and beating up all the men instead of Shrek, the huge and scary ogre. This also demonstrates incongruity because usually the princess is not tough and by her jumping up and beating the crap out of the men. This scene vastly exaggerated the abilities of the common princess.