What’s wrong with the foureye butterfly fish in Visual Explanations?

In the Boston class on 3/14, we were told that there was something wrong with the some of the fish on pages 114-116 of Visual Explanations. I’ve looked at the pictures quite a bit, but what’s wrong is not obvious to me.

One possibility is that the diver on page 115 appears to be pointing with his thumb to a Spotfin butterflyfish instead of a Foureye Butterflyfish. Another is that the Foureye butterflyfish in the drawings on pages 114 and 116 show a black eye band while the eyeband in the pictures on page 115 looks iridescent to me, not black.

Am I on the right track or is the problem something else entirely?