Oddly enough the mirror opposite made me think of ying and yang
It is complicated. I guess the inner motive is "balancing." So if these are two people, sorry to talk about this horrible situation, I'd think about similar positions. However, if there are two belts, they'd be tied in the "opposite" directions. Also, if one is longer than the other, one loop vs three is made to make the "ends" appear symmetrical, but the ends should be looking the opposite ways.
Now, I had this trait as a kid, now there are only traces left. If I am buying something in a store, and there are two stacks of sweaters, I pick one from the right stack and that makes the whole structure unbalanced, so I would put it back and pick the one from the left and buy that one. This is why I thought that maybe they tried to put on Honey's shoes the normal way but couldn't, it was unbalanced and then they put them backwards (I wonder if Barry had any footwear on.)
What else you can see in them: well, you know that when you waltz, you change the movement not to feel dizzy. But in such a person, you'd see it in all dances, if a person twirls to the right, he has to untwirl it to the left. Or tapping fingers on the table, if you have done it on the right, you'd do it on the left. Small things, but they are noticeable to someone who has the same traits. OCD usually burns our with age, so such a person might have had more symptoms as a kid.
(The police would know if staging looked like "symmetry" or not.) I just think that one person with good knowledge of the routines would have managed with Holly. And after that, Barry would present no problem. ((