Mine were mostly always brown and greatly varied in length and width. But anyway.
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The dead worms i have seen in my feces were brown too. But they didn't have a head like on the video, they had the same shape like the ascaris.
Like these :
But with a brown color.
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Doc Sutter said that the biting sensation happens when the worms let go.
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I don't know about the tapeworm, i haven't seen one dead.
Concerning the roundworm like the ascaris, i have noticed that the itches sensations always are felt in the same areas, that's where there is a bend in the digestive tube. My theory is that the sharp head of a big Ascaris worm can cause these itches sensations when it moves and hits the wall of the digestive tube.