User blog comment:Suparockr/List of Plotholes throughout the series/@comment-3325589-20120717070525/@comment-4950455-20120717080631

''On a related note, codex entries mention that greater weapon range is one of the main advantages Reapers have in ship-to-ship combat, but in movies we repeatedly see Reapers closing distance in order to use their main cannons on cruisers that are already firing at them. ''

This isn't a retcon; it's a product of some of the rather odd decisions made about the game would depict (as opposed to describe) space battles - it's more obvious in ME3 because you see a bunch of them, but right from the beginning how cutscenes depict space battles and how they're described in the Codex has diverged. According to (I think) that Patrick Weekes interview, this is a deliberate decision to pay homage to classic Star Wars - style space battles.

Personally, I think homages are all well and good, but what's the point of creating the Codex entries if you have no intention of sticking to them? But either way, it's neither a plot hole nor retcon as such.