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A good definition of "normalcy" N might be based on some measure of map-territory concordance, or a "registration error" being bounded below some quantity, E say. So N = 1/(1+E) perhaps. N =1 at E =0, N --> 0 as E--> inf.
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Misregistration (a term from the printing industry, referring to, for instance, CMYK layers of ink on a color page not lining up properly along edges due to printhead misalignment) is likely the best technical concept that looks like what we informally call "glitches" in reality.
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You could define E as % of area of a map that is "glitchy" (hmm... maybe a "glitch" is actually more like the 3rd derivative of normalcy, a la "jerk" in newtonian mechanics). As reality changes, the map tracks it, and E grows larger or smaller depending on how well you keep up
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