Cardle's rendition of 'Come Together' won praise from Cheryl Cole, who said that she enjoyed seeing the "cheeky chappy" side of his personality.
However, the ex-painter and decorator confessed in his latest video blog that he wasn't pleased with the end result last Saturday.
"Last week was fun - really, really fun - but I overcooked the vocal in a big way," he said. "I forgot about the extra 10% you give it when you are actually doing it live with the adrenaline of being on stage.
"I pushed it a bit more and it all went a bit Noddy Holder. If I could erase it off YouTube and iTunes, I would."