Compare Speaker 1 (Karen Thompson, yes you can watch her video again) to Speaker 2 (Olympia LePoint, yes you can watch her video again also)...How were their points similar and different?

Karen and Olympia are basically saying the same thing, as they both are saying that the other person (you) can watch a video again. And in this issue both speakers are similar.

But, on the other hand, Olympia includes the word "also" at the end of the sentence, which implies that Olympia is telling the other person that AS WELL AS OTHER OR OTHERS he or she can watch the video again. Karen, in fact, is NOT saying that so with Karen we can't know if she is letting only one person or a lot of people to watch the video again, something that we do know with Olympia because of the use of the word "also" in the sentence. In this issue speakers are saying something different.