It's tough to see in that video what I want to see, so I'm going to comment more on a few of the comments here than the video itself.
RE bar up in a straight line - not necessarily. The bar should actually move backward from off the floor. It should be starting over the base of the toes; the moment it separates, the shins will have moved back (and make sure the knees are flared to the sides like Derek said) so the bar can be pulled back into the body. Think of pulling back, not straight up. If you start the bar in the correct position, have a good back angle, etc. the knees will be out of the way by the time the bar gets to them - don't think of pushing the knees back, because invariably that attempt shoots the hips up and leaves the shoulders/bar behind.