The non-continuous line on the outside of the brim is just an effect from the unfinished priming at the beginning. As soon as the priming leads to a steady material flow the brim looks ok. It will not affect the print quality if the major part of the brim is printed correctly.
However, if you want to get rid of it, increase the amount of the pre-print-extrusion in your start.gcode.
The dotted lines inside the sparse infill are indeed from combing moves. If you loose too much filament with them and get underextrusion following such combing moves, deactivate it in the expert settings or use the RetractWhileCombing plugin. Printing cooler and moving faster (travel speed) reduces the effect.