[Eliot Ness]

You've gotten some good ideas to work with. As someone else suggested I think I'd go with a little wood filler and artists oil paints to blend in the color. Then try some fine tip pens or markers to draw in the grain. With a little trial and error I bet you can make that spot blend in pretty well.

On the crack I'd make sure you can't pull it together with clamps. If not then I'd be inclined to try a little filler in that small gap. Once again you can follow it up with some stain or oil paints to make it blend in.