Re: right to look for a procedural problem
Very much so!
I have made similar simple mistakes (although not costing anywhere near as much) and the real point is to find out "how do we stop this happening again?". Having a different reviewer helps a lot (as you read what you think you wrote, etc) but also looking in to the choice of component, etc, to try and make things unambiguous. For example, I always try to use SOT-23 (3-pin case) style diodes even though they take up a bit more board space so they can't go in reversed during assembly, etc.