‘Demon Slayer’ Mistakes You’ll Never Be Able to Unsee

‘Demon Slayer’ is packed with striking visuals and tightly choreographed action, which makes it easy to miss the tiny hiccups that slip through. Look closely though and you can spot small continuity blips, animation oversights, and storytelling contradictions that stand out once you know where to look. These are not deal breakers, just the kind of little goofs that eagle eyed viewers love to point out.

From shifting props to rule bending sunlight scenes, these are the kinds of mistakes that pop up across arcs like ‘Final Selection’, ‘Mugen Train’, ‘Entertainment District Arc’, and ‘Swordsmith Village Arc’. Each entry below points to what happens on screen and where you can catch it so you can verify it yourself the next time you rewatch.

Hanafuda earrings that change between shots

Ufotable

Tanjiro’s hanafuda earrings sometimes display slight pattern variations depending on the cut, especially in quick action scenes early in the story and again during flashbacks later on. Viewers have noted petals widening or the red sun motif drifting a touch closer to the edge in alternating camera angles within the same sequence. These are split second swaps that appear when the scene jumps between closeups and medium shots.

The shifts are easiest to notice in bright daylight scenes where the earrings fill more of the frame. Watch moments during ‘Final Selection’ and key confrontations where Tanjiro turns his head and the earring art briefly looks simplified in one cut and more detailed in the next.

Nezuko’s bamboo muzzle that quietly resizes

Ufotable

Nezuko’s bamboo muzzle can appear a little longer or shorter depending on the angle in certain episodes. In some closeups the segment spacing is tight and the end cap sits near her cheek, while a following shot shows wider spacing and a muzzle that extends past her jawline. The strap tension on the back of her head also changes slightly in alternating views.

These size jumps tend to happen when the camera cuts from profile to three quarter views during fast dialogue exchanges. The effect is most obvious in quiet scenes at Urokodaki’s home and during pauses in battle when Nezuko turns toward Tanjiro and the bamboo piece subtly shifts length.

Nichirin blade details that reset mid fight

Ufotable

Nichirin swords pick up nicks and grime in long battles, but a few sequences show blades that look scuffed in one shot and pristine in the next without time for maintenance. Zenitsu’s lightning marked sword and Inosuke’s jagged dual blades are the most noticeable because their edges and patterns are easy to track from cut to cut. Chips on the teeth of Inosuke’s swords sometimes vanish between exchanges before reappearing later.

This happens most often across fast intercuts that jump from closeup blade clashes to wider acrobatics. Check the flurry scenes in ‘Mugen Train’ and ‘Entertainment District Arc’ where the camera swings behind a character and the blade texture suddenly looks brand new for a beat.

Sunlight rules that get a little flexible

Ufotable

The story establishes that direct sunlight incinerates demons, yet a few early travel scenes show Nezuko peeking from the travel basket with light streaks slipping through the weave. The rays cross her face in certain angles while the next cut shows full shade coverage, even though the basket position did not change. Interior daylight near doorways also brushes close to Nezuko without reaction in a handful of shots.

These moments are easiest to spot during daytime road journeys and village exteriors before the group consistently uses heavier coverings. The inconsistency appears as bright patches touch skin in one frame while the following frame presents complete shadow, implying the light placement moved between cuts.

Visible breath effects in scenes set in warm conditions

Ufotable

Breathing forms receive stylized on screen effects that look like vapor, and some scenes also include visible frosty breath from characters while the setting reads as temperate. A character exhales a white plume while standing near sunlit greenery, then the next shot removes the plume for the surrounding cast in the same space. The air clarity and clothing layers suggest the temperature did not change, yet the breath mist appears and disappears within seconds.

This is most noticeable in outdoor training sequences and cliffside confrontations where the sky is clear and the environment shows no winter cues. Watch for exhale puffs appearing in one closeup, then cutting to a wide view where no other character’s breath is visible despite similar exertion.

Crows that deliver messages with improbable timing

Ufotable

Kasugai crows bring missions across long distances, but in several episodes they arrive immediately after a battle that just concluded minutes earlier in story time. The preceding scene places the party far from a Wisteria rest stop, yet the messenger lands almost instantly with detailed orders that would require time to draft and dispatch. The quick turnarounds make the crows feel faster than the travel montage suggests.

You can spot this during transitions between arcs when the party receives a new directive moments after the previous threat ends. The continuity compresses travel and coordination windows, creating the impression that the crow crossed multiple regions and found the group in a fraction of the time earlier episodes assign to similar journeys.

Wounds that migrate a few centimeters

Ufotable

In big fights, gashes and punctures sometimes shift position slightly when the camera repoints. A slash that crosses the upper chest in one shot sits closer to the shoulder in the next, or a bandage covers a mark that was previously shown lower on the torso. These small location hops tend to line up with costume folds that change as characters twist during combat.

The effect is most visible in prolonged duels where the character takes a signature hit and the mark becomes a reference point in following cuts. Rewatch late stage clashes in ‘Mugen Train’ and ‘Entertainment District Arc’ where the same injury appears at two slightly different heights as the angle switches.

Uniform damage that heals between cuts

Ufotable

Demon Slayer Corps uniforms take a beating, tearing at seams and sleeves, but certain edits restore fabric for a shot then return it to the damaged state. A ripped haori hem looks jagged during a leap, appears clean in the landing closeup, and reverts to torn when the character sprints again. The haori patterns make these resets easy to track because the missing chunk should remain missing.

This is common in set pieces that interleave hand drawn cuts with effects heavy cuts. Pay attention to Tanjiro’s checkered haori and Zenitsu’s patterned haori during multi enemy skirmishes, where edges flicker between frayed and intact across consecutive angles.

Demon regeneration speed that varies within the same exchange

Ufotable

The series shows demons regenerating at different rates depending on their strength, yet a few scenes show the same opponent regrow a limb instantly in one cut and much more slowly in the very next cut with no change in exertion or damage level. A severed arm is back for an attack, then subsequent frames return to a half formed stump that takes several beats to finish restoring.

Look for this during night battles where the camera cuts between attackers circling a target. The regeneration bar hops are clearest when multiple slayers land blows in quick succession and the demon’s state seems to roll back and forth with each angle change.

Inosuke’s boar mask with shifting eye openings

Ufotable

Inosuke’s boar mask eye holes widen or narrow to accommodate expressions, but a few shots take the change further than established, giving him much larger openings that expose more of his face before returning to smaller slits moments later. The seam lines around the snout also move slightly to match the altered eye shape, then shift back when the camera pulls away.

These variations show up in high energy taunts and mid fight banter. Watch early encounters with Tanjiro and shared scenes in ‘Entertainment District Arc’ where the mask looks unusually open for a reaction shot and then tightens again in the following frame.

Share the tiny goofs you have spotted in ‘Demon Slayer’ in the comments so everyone can try to catch them on their next rewatch.