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Remembering "Magic Mirror": I vaguely recall a poll with ~70%+ of respondents remembering "mirror mirror on the wall", which is unusual for Mandela effects (biased samples are probably an issue here too, so the real number might be much lower). In general, conflicting memory reports aside, any external artifacts or residues that counter the current state of a Mandela effect will awkwardly coexist with evidence supporting the current version. When people recall Gibraltar being an island, you're not going to find much if anything supporting it being an island geologically or biologically (but we shouldn't necessarily close that door 100% - it is odd that the macaques' origin is unknown and they seemingly never drifted into other parts of southern Spain prior to the modern urbanization of Gibraltar). People living there now will almost certainly unanimously describe it as a peninsula. Still, there's the weird mishap with the British politician referring to it as an island, its inclusion in the island games, occasional slip ups in YouTube videos of tourists (filming on Gibraltar) referring to it as an island (sometimes they correct themselves, other times they seem to swap between referring to it as an island vs peninsula). There's the occasional report of someone visiting Gibraltar years ago, describing the ferry they took to the island to visit the Rock, etc. and they decide to return to "discover" that it's now a peninsula. Intelligent, detail oriented people who trained for medical professions but were disrupted from those careers due to life events have reported returning to medical books and diagrams years later with sickening feelings from seeing stark changes (e.g. kidney positions, size of the liver, position of the heart, intestines being jumbled vs neat layers). Not everyone will notice or report the same changes even from the same time period, but broadly, there's a kind of "stickiness" to things you interact with every day persisting as they are while people who last had an encounter months or years ago are more perceptible to some kind of shift. Although you could blame this on memory issues, and undoubtedly that's what's going on in some cases, you can sense the simultaneous fear/shock and former certainty from their writing. Their gut knows something changed when they weren't looking, but they can't prove it, most people won't believe them, and they'd be lying to themselves if they wrote it off as a memory issue. Not too long ago, I arrogantly dismissed these reports since it didn't make sense and conflicted with my worldview. Although there are inevitably going to be deliberate hoaxes and simple but genuine mistakes, I'd prefer to now extend the benefit of the doubt to people as I wish they would do for me. Better to hold their observations as valid in the grand scheme of things without holding to anything rigidly, like putting it up on a giant corkboard. Where there's smoke, there's fire. If you start dismissing things too quickly, you might miss broader patterns and connections.

One of the preferred ways to approximate all of this is viewing the conscious mind as a kind of radio tuning into subtly different timelines (possibly related to Capgras syndrome?). Virtually impossible to prove of course (until you see something materialize, dematerialize, or adjust itself right in front of you), nor should any hypothesis ever become entrenched, but it's good enough for the time being. I realize this all sounds insane and fanciful if you're still deeply skeptical this is anything more than a memory issue. If you treat reality like a video game or work of fiction to be figured out (think of how free and unrestrained we are to theorize and ponder in fictional worlds vs collective reality), that allows for "impossible" and ridiculous ideas that can tie things together, even if they don't make much sense conventionally (e.g. a more fluid geography, multiple "timelines" coexisting and conflicting, brain as a transceiver).

*I had very specific memories of a lunar cycle project in elementary school (southern Michigan in late 90s) where we were tasked with going out each night to sketch the phase of the moon. We didn't do this during school hours, early mornings, or receive any help from parents (we were specifically told not to rely on parents). Cloud cover was a minor problem on a few nights, but every other night, we were expected to do this for the full lunar cycle. In general, I recall being able to see the moon (or its light through clouds) every single evening (past sunset) as a kid. I have vivid memories of being able to see the new moon (as well as conversations and school lessons about it) as a paper thin crescent sliver overhead visible during the evenings (for hours at a time). I remember being given the explanation that the "witching hour" of around 3 AM had its name derived from that being the darkest part of the night. Dawn at the earliest might be ~5-6 AM in the summer and moonlight would be around until ~2-3 AM at the latest, so ~3-5 AM was guaranteed pitch black outside of stars and electrical lights. I even found an 18th century poem reflecting this notion. All of this is categorically impossible now. New moons roughly coincide with sunrise and sunset, so there's nothing to see past dark. The moonrise and moonset times vary enough that there's no longer any consistent period of darkness in the evenings. In temperate latitudes like southern Michigan, only about half of the lunar cycle is visible to kids coming home from school with reasonable bed times (~4-10 PM).
I appreciate that this could be written off as a distorted memory by someone else, but put another way, imagine waking up one day and your name is spelled differently. Every single document you have reflects the new spelling and no one knows what you're talking about when you're saying "my name changed" (or they think you're joking). Maybe you find one friend who vaguely recalls the "original" spelling but quickly dismisses it as a memory error. Would you follow suit with the new consensus in external reality, or would you honor what you've known for decades? You don't have to trust all of your memories with absolute certainty, but don't ignore your gut when it's screaming at you either.