Flaws

Attacking the person you are arguing rather than attacking the arguement.

An arguement that starts and ends with the same point, and does not move forward.

Treating two concepts that may be similar as if they are exactly the same.

What is necessary in a situation may not be sufficient (not enough).

Reasoning which assumes a causal connection between two events when there is likely to be some connection and many other explanations. 

Reasoning which assumes a causal connection without good reason. Just because one thing happened before another thing, it is not necessarily the case that the first thing is the cause the second thing.

Pretending that there are only two alternatives when there are, in fact, other possibilities.

An arguement that goes too far too quickly. One thing leads to another, resulting in an extreme conclusion.

Deliberatley distorting the arguement of the opposition, in order to make it easier to fault.

Generalising from a limited sample or from a single example.

Arguing that something is okay because others have done it - 'You too.'