Alton Brown is an American TV personality with his own cooking shows. I am not sure what TV-show this is, but he is building a derrick for deep frying food outdoor safely.
The first knot he uses is a figure eight knot. I am not sure why he uses it. To keep the rope from unraveling perhaps?
For the second knot he shows the landlubbers tying method for a bowline.
He doesnt explain, but he uses a common rope setup which gives him a 2:1 mechanical advantage when lowering and elevating the bucket.
The third and last knot is a cleat hitch.
A true knoting enthusiast would probably have used more ropework. The ladder could have been replaced with a tripod made of logs and lashings. The ziptie could have been replaced with a binder knot. This is however a food show and not a knoting show.
https://www.youtube.com/watch?v=O14bgW8xmqk