Those continuity issues are of the least concern when it comes to editing. I’ve never noticed them before and I still can’t see what they are (on my phone). Far more jarring would be something like the skiff pointing in one direction in one shot and another in another.
I would have to watch the scenes in question to get a better idea of it (and that is how a cut should be judged, not just by looking at stills), but at the end of the day no matter what you have to realize that if a professional editor flipped a shot there was a damn good reason for it, and an eagle eyed fan pointing out Carrie’s birthmark is in the wrong spot is not a good enough reason to flip it back.
Yeah I agree that I’ve never noticed these flip shots before so they obviously work well and I do wonder if they get noticed as continuity issues from over-analysing a movie frame by frame (or like many fan editors, have simply gone over the material too often to not notice such details) rather than as an edit was meant to be viewed in the context of how it is expected to be viewed (as a motion picture). I highly doubt any but a very few would ever notice such matters during the first or even first handful of viewings when your mind is focused on all the new information it is receiving rather than critically comparing such minor (at the time) details.
One does have to ask though, why then isn’t this 180 rule taken into consideration much more when actually filming the scenes? Is this not part of the directors job?
For anyone that doesn’t know what the 180 rule is (like me 5 minutes ago), below is the wiki explanation:
In film making, the 180-degree rule is a basic guideline regarding the on-screen spatial relationship between a character and another character or object within a scene. An imaginary line called the axis connects the characters, and by keeping the camera on one side of this axis for every shot in the scene, the first character is always frame right of the second character, who is then always frame left of the first. The camera passing over the axis is called jumping the line or crossing the line; breaking the 180-degree rule by shooting on all sides is known as shooting in the round.
The 180-degree rule enables the audience to visually connect with unseen movement happening around and behind the immediate subject and is important in the narration of battle scenes.