They are included to just show you the specific technique you have been reading about. It can be a bit difficult to get a read on what’s happening without the context of the full interaction. So it would have been nice to be able to see longer versions of the footage, however it’s made clear than you can see the full clips by signing up for a separate program,  which you can find out about . (Note: Pickup Tube was shut down in 2012 and is no longer available).