How I Met Your Mother Easter Eggs

1. Insert disc 2 of the Season 4 set of How I Met Your Mother.
2. Go to "Special Features."
3. Go down to the Barney's music video, but don't click it.
4. Go down one more time
5. A previously hidden symbol should be highlighted in blue.
6. Click... more

In the episode 6x13, there's a countdown from the number 50 to the number 1. You can see them all here: http://www.youtube.com/watch?v=N0sPQkKMo5s

50 Pamphlet on doctor’s desk
49 Pamphlet on doctor’s desk months later
48 Ketchup bottle
47 Laser... more