L smelt sickly eggs by the barrel, and rotten cabbages, and such things, and if I know the signs of a dead cat being around, and bet Ido, there was sixty-four of them went in. What insight does this comment reveal about the character of Huck?

It indicates that Huck frequents places perhaps grocery stores where the conditions are not sanitary what with "sickly eggs and rotten cabbages and dead cats" in other words, Huck cannot afford to frequent fancier shops or fancier homes because he is poverty stricken and used to such sights.