Dragging Ankle
 

I went through a rigging tutorial from spinquad and I think I followed all of the guidelines. The problem is that after I add the weight maps the legs and feet move fine, but the slight segment in between stays put. It's really annoying and I can't figure out what's wrong.

Double check your wieght map. This usually happens when a point or two haven't been assigned to the map.

TowerFan's right.
It could also be that you assigned a left side map to a right side bone or the other way around.

But in your case, it looks like you forgot to asign weight values to a loop.

Also check if you have the same problem in the other leg.

Cheers!