These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Critical Research Failure: "[The sai is] an offensive weapon. For killing." No, it's not. It's a defensive weapon for disarming and breaking swords. A sai is capable of some pretty horrific damage against someone, but Hollywood treats it like a knife, when it's a blunt instrument.
Fanon Discontinuity: Originally Elektra was just a normal girl who ended up going down a very dark path after the tragedy of losing her father. In the Man Without Fear miniseries showing how Matt Murdock became Daredevil she's portrayed as having always been a psychopath, hearing voices and intentionally going looking for trouble so she could murder her assailents. In an odd parallel to Selina Kyle's prostitute past from Batman Year One, this is one part of an otherwise well regarded series that a lot of fans would prefer to ignore.