Place it right after the mistake is revealed in an edit, then follow it with an awkward moment sting to hold the embarrassment, or lead into it with Yamete Kudasai when a plea is refused before the apology.
About this sound
Kurapika delivers a short Japanese apology lasting about two and a half seconds, repeating 'sumimasen, yurushite kudasai' in a hesitant, reluctant tone. It feels awkward, sheepish and a little pleading, like someone apologising again because the first try did not quite land. The line comes from Hunter x Hunter, where Kurapika offers the apology a second time.