Treat your written statement as your personal interview with the law school. If you have a legitimate explanation for either, let the admissions people know, either in your personal statement or, better yet, in an accompanying letter. But it had better be good. But seriously, if you have a valid justification for deficiencies in one area of your application, you might let law schools know about it. Do not list fifty activities.
Law schools can spot r sum -padders who flit from club to club doing nothing in depth.
Furthermore, none of your fifty listed activities will stick in their minds. It is better to highlight your most important activities, the ones where you actually have done something. Be honest with law schools. Choose faculty members who know you well and for whom you have done well. A mix of professors from inside and outside of your major might be a nice touch, but is by no means necessary.