Sometimes its subtle, sometimes not. But its pervasive. This is where I'm going to highlight some of it.
Here's an edit I've had to make in numerous places. Here is when it was added in. Looking at the history of the ip address from which it was added, the user(s) enjoyed editing articles on Nazi Architecure, the Aryan Race, Propaganda (ironically), and Final Fantasy VII. Amazing that the edit was there for 7 months and no one touched it. This is just one example of the subtle bias that pervades wikipedia, particularly on articles relating to South Africa.
Here's another I made: . Here is where it was added in: .