Blob Brush strokes often include garbage on turns
What is wrong with Blob Brush. Even with simplest strokes I often get groups, and these have the main part and tiny pieces of garbage next to it in them.
Sometimes these are thinnest slivers, sometimes knotted madness, sometimes chunks chomped off...
If I run simple Pathfinder Add, some of this get 'healed'. Why don’t you do at least this? Why these awfully angular turns and garbled edges happen in the first place? Please study the file.

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Matthew commented
Same issue here. Release version 29.3.1. Using basic pressure options. Several blob brush strokes are being created as groups with stray objects.
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There is a general report about brushes adding various garbage: http://illustrator.uservoice.com/forums/601447/suggestions/34128700