How easy or difficult was it to find articles that needed editing? Were the errors you found factual or grammar / spelling?
Two TV shows come to mind -- South Park when Cartman parodies Will Smith's "The Wild West"
"Well, I'm a badass Cowboy livin' in the Cowboy days.
Wiki, wiki, scratch, yo, yo, bang, bang.
Me and Artemus Clyde frog go save Salma Hayek from the big metal spider.
A wiki wig wig wiki wiki wig
Fresh cowboy from the west side
Wiggy wiggy scratch yo yo bang bang
Me and Artemus Clyde frog go save Salma frog polly prissy pants
Go down to, well... rumpletumpskin"
and 2
The episode of 30 Rock when Jenna is going "in character" for her Janis Joplin biopic and the writers get into Wikipedia and make up all these weird things that Janis did so that Jenna will do them too. [the picture below is where she's about to eat a cat since that what it said in Wikipedia]

So to answer
How easy or difficult was it to find articles that needed editing? Were the errors you found factual or grammar / spelling?
Wayyyyyyyyy easy. The errors that I found weren't really errors -- they were phrases that were written in a way that could be considered absolutes, when in actuality there were other options. [that's a thing with me...]
Anyhoo, edited without an account and poof, it showed up. I was under the impression that one needed an account to edit, but today I learned something new. Thanks!