If you're curious about the details in this case, ScotXW confuses EGL and OpenGL, the arrows aren't quite right, and the labels aren't quite right either (DRM is labeled "hardware-specific" but KMS isn't? The label for "hardware specific Userspace interface to hardware specific direct rendering manager" is quite weird), and some important boxes are flat out missing. It's nitpicking for sure, but when the diagram goes out of its way to add extremely weird details, it demands nitpicking.
Nobody in the Linux graphics community would draw the diagram like this.
I love wikipedia and I read to procrastinate by reading the articles for everything I am interested in so I have found quite a lot of factually incorrect information or statements of fact which are really philosophical opinions. However usually these problems coexist with a certain change in writing style (loss of formatting, grammatical errors, random capitalizations, change of tone, etc.). I find I haven't found many problems with content written in the usual "wikipedia" style, so I assume the hardcore wk editors who enforce this style care a lot about factual accuracy. However I don't read enough outside of wikipedia so I wouldn't know if everything is correct...
(actually now that I think about, maybe I am more likely to agree with things in the wikipedia style. But I think the style errors and factual errors are at least a bit correlated.)