Those circles were later added on the video. You can also see that the "9" trailer , when switching from fullscreen to the task viewer, does not resize correctly. (You've got to see it frame-by-frame to notice it)
The video uses some frames, but some things look a bit different than the actual GUI.
Also, they obviously did not show the real transitions and all that otherwise it would be choppy and show us the truth about the N900