Warning: Spoilers ahead for The Batman.
Robert Pattinson's Dark Knight in The Batman may have looked excellent, but there was one hilarious problem with his character's design. Matt Reeves' The Batman is a grittier, more grounded take on the character, with its Gotham a much more realistic and sinister place than many other iterations. Following the titular vigilante in the second year of his crusade for vengeance, The Batman sees the Caped Crusader go up against the Riddler, the Penguin, and various other criminal elements of Gotham's underworld.
With Pattinson's Batman up against Paul Dano's Riddler (who was inspired by real-life serial killers), The Batman's eponymous hero is a slightly different take on the character. He lacks the muscles of previous versions, and The Batman puts much more of an emphasis on his detective abilities than other Batman movies, making its take on the character feel distinctly unique. The design was a grounded take that still managed to maintain a level of accuracy to the comics, but it did have one hilarious flaw.
Pattinson's Batman is regularly seen riding his motorcycle around Gotham, moving around unrecognized thanks to his helmet. However, on a handful of occasions, he rides his motorcycle wearing his vigilante get-up - a costume that includes a long, flowing cape. While this might be a great look for The Batman's vengeance-driven hero, it presents a major potential problem in Reeves' more realistic world.
Batman's cape is such an iconic part of the character that he simply wouldn't look right without it - and The Batman's version of the character is no exception. Pattinson's Batman also makes extensive use of his motorcycle throughout the film, favoring it over The Batman's Batmobile. This makes more sense within Reeves' more grounded world, as Pattinson's Batcycle would allow for much faster and less obvious travel across Gotham. However, the way that his cape and bike would most likely interact would look decidedly un-heroic: the cape would almost certainly become caught in the motorcycle's rear wheel, unceremoniously dragging the vigilante from his seat and onto the tarmac.
The Batman might see Robert Pattinson wear a different Batsuit to previous Batman actors, but the issue isn't limited to just his version. Any Batman that wears a cape and rides a motorcycle would likely face the same issue, although The Batman's more realistic world makes the problem all more obvious. Throughout the film, the issue is avoided by Pattinson riding the bike without wearing his vigilante gear, although, in the film's final scenes, he can be seen riding off into the sunset with his cape flapping dangerously close to the bike's moving rear wheel.
While the issue of this particular wardrobe malfunction isn't a new one, it is compounded by The Batman's Gotham City being that much more grounded and gritty. In The Batman's more serious setting, the idea that Batman could be unseated by something so mundane is much funnier, and therefore more obvious. Whether Matt Reeves will address the potential problem in sequels to The Batman remains to be seen, but in the closing scenes of Pattinson's Dark Knight debut, it made for an unintentional theoretical issue.