I say unto you, verily, use strict and warnings! Had you followed this sage advice, you'd have known immediately that you had mistyped a variable name.

      print Dumper $bbData;
      $e  =   $bbdata->[0];
      print Dumper $e;
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On the first line, you refer to $bbData (with a capital D). On the second line, you refer to $bbdata (with a lowercase D).

As to your question, you can access the element you want with $bbData->[0][0] or ${$bbData}[0][0] or $bbData->[0]->[0] or maybe a few more I'm not thinking of. I recommend the first.