>>213888029
>>213906070
>is this 覚えたて then referring to the rebuke she received from 大久保…さん?
I don't think it's referring to the rebuke but to her 敬語.

It's a Japanese comedy show, so it's likely that she intentionally dropped さん from the name to make the show more entertaining.

Calling an older person by their surname without さん is considered to be pretty rude and disrespectful to them in Japan, but the sentence she wrote is polite and perfect other than this point.

This act gives the audience the impression that she tries to make 大久保さん angry by pretending to be stupid.

説明するのが難しい