The pimple which you mention on your 11th green is integral to the hole as well as a feature used by many classic era golf course architects. Specific to Flynn we see this feature on many of his courses. He would often have three high points within one green at various points around the dial. Some HP's are found within the green (but close to the edges), some outside the edge of the green and some found to be on the edge of the green (now collar) and rough. With the 11th at Concord playing uphill, this particular "pimple" helps with defining the back edge or limit of the green. Combine this with an original false-front and a visible high point at the rear of the green, the majority of golfers therefore have an idea of the overall depth of the green from front to back. They also will provide a certain amount of ball containment. They act as a feature on the surface which golfers must contend with when putting.
When the green is reconstructed this Fall, you will see not only a expansion of cuppable area but also an expansion of collar and green to further highlight the HP and the other character that is lost when subtle undulations and contours are covered under 2+ inches of rough or step cuts.
The greens at Concord, and the bunkers for that matter, are such a deviation from "standard" (yes, I know not the best word to use) designs of Flynn. The place really has a look and feel, especially the greens, of a Ross course. Would love to find out who built the place. After all we know Gordon built Philmont for Park and that may be where all the confusion came about because the bunkers looked so much like a Flynn course. Makes me wonder if JB McGovern built Concord for Flynn.