cyborg ninja 14 said:
Like how V managed to mass produce thousands of costumes and ship them everywhere. Just one example.
That's not a plot hole. A plot hole is a hole in the internal logic set up by a movie.
For instance, the
Back to the Future movies have some enormous plot holes due to constantly changing the idea of how time travel works.
Another example would be from
Indiana Jones and the Last Crusade where Indy makes a mistake when spelling out Jehova with a J, instead of an I (as in latin). The letter he steps on crumbles - thus establishing the kind of trap the whole thing is - but he catches himself on an adjacent letter. The letter he holds on to is not a letter in Iehova either (so why didn't it crumble, as established that it would?).
Now, in the internal logic of
V For Vendetta we do in fact get to know that V is quite resourceful. He can make theatrical masks, steal stuff from government buildings, and transports (indicating some form of access to government transports as well), etc. Taking this into consideration it's not at all moving from the premises set up by the movie that he could get ahold of a lot of Guy Fawkes masks, especially considering he has had a very long time since he started planning his "revenge" (something like 20 years, right?).
You might question that someone could be this resourceful, but that's another discussion, and not one about plot holes.