His song entertained everyone as a bit of fun.
We laugh off the mistake as just a bit of amusement.
Standard polite form with honorific ご. The kanji 嬌 is common in this word.
Variant using 敬 instead of 嬌; less common but still seen.
Polite prefix ご + 愛嬌 (charm, amiability). The kanji 嬌 suggests attractive, charming behavior.