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Like I said in my first post, replace the O2 sensor.
As for the exhaust, the spring joint is normal. It provides a place for the exhaust pipe to flex a bit. Also, unless your exhaust is noticably loud you don't have a leak. That crack is in the heat shield around the pipe, nothing to really worry about for now.
Also, when you do the plugs, take pictures of them or at least look at them. That'll tell how if you're running rich or lean. From the looks of the inspection you're running lean.
EGR build up may be an issue. If you get a picture of the engine bay we can probably point it out. There should be a metal line of some sort going back to the intake manifold from the exhaust/head with a valve in there.
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