my favorite is in ESB after luke kicks vader off the platform in the carbonite chamber, he deactivates his lightsaber and jumps down...onto a trampoline. his upper half bobs back up onto the screen. definitely a blooper and a funny one. the potato/shoe asteroid thing is funny too. those crazy spfx techs slipped it past george in the dalies. i'm pretty sure there's a similar thread already.

EDIT: btw, i never noticed the chest grope before. that's great. when you pause it, leia almost looks pleasantly surprised...