The arrays and their supporting structures appear to be significantly different from each other, suggesting design improvements or slight repurposing. Looking closer at the images, I see auxiliary structures on each one. What are all these things and how were they used?
Some appear to be sun-dial-like (for want of a magnetic field), and at least one looks a little like a bubble level with a vertical tab next to it. I'm pretty sure B is not there to blow moon dust off of the array :) - it could maybe be an infrared thermometer, but was there telemetry? See this, page 8 for a discussion of the relevance of the widely cycling temperature of the array - for Equivalence Principe (EP) experiments it's necessary to measure throughout the entire 27 day long lunar day-night cycle.
Only one shows the faces of the reflectors directly, and they appear to be corner-cubes, which, individually at least, don't necessarily have to be pointed very accurately at all in every-day use, although I imagine an antireflection coating might have a cone of best performance.
Since the orientation of the arrays is always changing due to Libration - albeit in a very well determined way - if careful orientation was necessary, or at least careful documentation of the orientation, why?
below: Apollo 11 LRRR annotated detail, original image here (0.7°N 23.5°E)
below: Apollo 14 LRRR annotated detail, original image here (3.6°S 17.5°W)
below: Apollo 15 LRRR annotated detail, original image here (26.1°N 3.6°E)