I just stumbled upon this very interesting read on a specific type of observation bias, called Inspection Bias. Inspection bias is the phenomenon that happens when the point of view of the observer creates a bias. An example is that e.g. when you ride your bike on a track you may observe a lot of much slower riders and a lot faster riders than yourself just by the fact that due to your own speed keeping other people of the same speed at approximately the same distance.

Check out the article here.