Abigail realizes she's been blocking off her love for Jack. It takes the literal breaking, or at least attacking of his heart to reveal her true feelings.

Jack always embraces ghost Susie. He sees her like she sees herself – as someone who lives somewhere else, but can still come back and visit. Abigail has a much more guarded attitude toward the whole ghost thing.

Len's gesture is appreciated, at least by Jack. Again, we see him trying to create order in a disorderly world, even if it means not going by procedure. Of course, he's also hoping to disrupt a little order here, too. He probably wouldn't mind if Abigail chose him over Jack.