The phrase “no great shakes” means “no great thing” or “insignificant.” The term may have arisen from the idea of shaking dice and then having a disappointing toss. If so, it would fall into a long line of words...
“A riddle, a riddle, I suppose, a thousand eyes and never a nose.” Nothing shakes up the dinner table conversation like a good potato riddle! This is part of a complete episode.