Some Good? Bad? Presentation Samples

Below are a few presentation examples from the Internet.
What aspects of these presentations are good? What aspects are not so good?

Any presentation has room for improvement, so the important thing for you, as ICU students, is to keep developing your awareness of the characteristics of good presentations!

For example, in this first one, can you see what she is doing wrong in the first presentation? Try comparing it to the second.



Here's a creatively produced bad example. Please DON'T make presentations like the video below!



Finally, here is an example of a non-native speaker at Harvard. What are his techniques??



and here is an example of a "persuasive" speech. What aspects are good? What are the weaknesses?