Jimmy's error is that he used 6 as the factor, which is not common to both 24 and 6.
The distributive property involves factoring out a common factor from both terms in an expression. In this case, 6 is a factor of 6, but it is not a factor of 24. A correct application of the distributive property would require identifying a common factor of both terms. In this case, the common factor you could factor out is 6 from the number 6, but not from 24. Therefore, the correct application of the distributive property is not represented in his equation.