As always I loved the bit where we see everyone else moving in slow-mo while Clark is going at super-speed.

When Clark was up the windmill looking for Chloe just before switching to x-ray none of the ground looked freshly dug up.

Was that kryptonite in the coffin with Chloe, why did it seem to lose power and not affect Clark.

I think it was a lantern that was dying out.