Recently, there has been considerable excitement over results showing one or more narrow features in the spectra of gamma rays coming from the region of the Galactic Center. In this presentation, we will point out aspects of the instrument response at 130 GeV that could potentially give rise to an apparent excess of events in a narrow energy band, in particular, the pertinent aspects of our event reconstruction, event selection and energy assignment algorithms. We will describe studies that can be used to distinguish between instrumental and astrophysical signatures, and rule out many potential instrumental causes. Finally, we will discuss how instrumental uncertainties should inform strategies in line searches.