Originally Posted by cyccommute

Bunny hopping...even giant ones... can be done without clipless but it requires a very different technique and much more finesse. Rather than pull up with your feet like you do with clipless, you need to bounce the bike and twist your hands forward on the handlebars to get the rear wheel off the ground. It helps to do the same with clipless but it's a lot less necessary to do so.

Without clipless, you are also just getting your feet out of the way so that the bike can bounce upward while with clipless you are drawing the bike up with you.