The T/G "Schrodinger" isn't actually a Schrodinger: the correct answer is 'G', but I accidentally entered it as T in the original grid and Crosshare doesn't appear to let you edit grids after publication.
Classic theme, fun fill! Shame about the typo. Petition to lean into the Schrodinger and update the impacted clues to: 12A: "Woman's name hidden in 'The impact of entering the wrong letter into a crossword is staggering' 5D: "The most common letter in this clue is either … uggggggh … 'e' __ '_'."
12A: "Woman's name hidden in 'The impact of entering the wrong letter into a crossword is staggering'
5D: "The most common letter in this clue is either … uggggggh … 'e' __ '_'."