Justice League — Henry Cavill's Mustache (2017)

Justice League's Henry Cavill mustache removal is the most mocked visual effect in superhero cinema, as Warner Bros. digitally erased his facial hair from reshoots due to Mission: Impossible contractual obligations. The resulting rubbery upper lip on Superman cost $25 million to fix, yet 80% of audiences noticed the flaw, outperforming #1 in sheer distraction by making a single actor's lip a global meme. This fiasco is 30% more ridiculed than the average CGI error, proving that even a tiny detail can ruin a $300 million production.