mistake in envelope on blue

mistake envelope error oversight slip-up blunder fault inaccuracy flaw misstep mess-up boo-boo faux pas miscalculation gaffe misjudgment flub misinterpretation misreading fumble misunderstanding confusion bungle misprint faulty inexactness defect blemish imperfection misapplication misidentification deficiency mismanagement misconception false move stumble misstatement miscommunication step inattention failure incompetence error-prone misguided inconsistency