Are a few Multiple follicular units (2 hair grafts) in the Transition Zone ok? (photo)

In general doctors use one hair grafts for the front hair line.  Once in awhile you may see two hair grafts that were placed by mistake or the single hair graft that contained a dormant extra hair follicle.

Hi there. This can sometimes happen despite meticulous sorting of grafts. Given you are at the two month stage I wouldn't worry about it just yet. Having a few 2 hair follicles in the hair line is not going to result in a 'pluggy' look. My advice would be to wait a year and then maybe have a mini mini transplant to hide the follicles if needed. 

This is a very individualized situation, in which the size of the grafts need to be properly suited to never compromise naturalness, while optimizing density.  In some patients with light and or curly hairs, the occasional 2 hair graft can actually be advantageous.