On the Coursera site, you can watch the video faster. I love the 2x button and the 1.5x button, and use them frequently. How often I’ve wished for a 2x speed button when I’m sitting in an actual lecture.
The pause button is another great feature of online lectures. Sometimes when I’m watching a complicated derivation, I can’t quite follow it in real time, so I hit pause and work through the derivation myself.