So when did ads start getting injected into syndicated TV?

And why does it bother me so much? This episode of How I met Your Mother was on late last night. It originally aired in 2009. What caught my eye was the laptop on the conference table with an ad for The Green Hornet... So I downloaded the episode and sure enough, the laptop was added into the scene!

Does this happen all the time? Am I just normally non observant?