Historical clue formulations

• "I messed up" — 2026-08-12
• "So sorry!" — 2025-02-22
• "That's on me" — 2025-01-16
• "That's on me" — 2024-06-02
• "Oopsie!"... and a hint to the ends of 18-, 25-, 39- and 50-Across — 2022-12-05
• "Mea culpa" — 2021-07-11
• "Whoops, sorry about that!" — 2020-05-10
• "I goofed" — 2020-04-23
• "Oops, sorry!" — 2018-02-13
• "I goofed!" — 2017-08-07
• "Oops!" — 2014-08-25
• "I messed up!" — 2013-12-31
• "Whoops" — 2013-10-30
• "Oops, sorry" — 2012-10-04
• "Oops!" — 2011-08-17
• "Whoops!" — 2011-03-15
• "Sorry, I did it" — 2009-02-19
• "Oops!" — 2007-07-29
• "Oops! I made a mistake" — 2007-06-18