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.
Hallie Shea, despite "coming between" the designated Official Couple of Jim/Maggie. Quite a number of fans wish that Jim would end up with her instead. This is probably at least partly due to the fact that Grace Gummer apparently inherited a sizable chunk of her mother's acting talent.
Foregone Conclusion: The end of "News Night with Will McAvoy" was telegraphed quite far in advance. At least for Sorkin fans, Tropers and other longtime TV viewers.
Harsher in Hindsight: In season 1, Maggie tells Jim about an HR incident precipitated by her confusing Georgia the state and Georgia the country, and then sending a condolence bouquet with "LOL" on the note (she thought it meant "lots of love").
Jim: How do you still work here?
Maggie: ...I dodge bullets. Here comes a bullet- *boom* I'm over here! Here comes another- *boom* Over here!
Then comes her trip to Africa in season 2... For context: Yes, Maggie does dodge bullets; the people around her, not so much.
Likewise, in the third episode Jim tells Maggie that she seem like she's "under sniper fire" during her Freak Out.
In the first season, McKenzie accidentally sends a lot of people a private message by misunderstanding how to work her Blackberry and the Newsroom later covers the Anthony Weiner Twitter fiasco. In September 2012, after the first season had aired, Allison Pill (Maggie) accidentally tweeted a nude photo of herself to her public profile.
There is a subplot in season one about the NSA gathering data secretly and illegally on US citizens. This was written in 2012, a whole year before Edward Snowden and the NSA spying scandal came to light. By season 2's "News Night with Will McAvoy," Charlie is meeting with an old agency contact, and they rather blithely refer to the infamous "Utah data center"note The contact jokes about how people will think they're stupid for putting heat-sensitive computers in the middle of the desert. that the NSA is building for PRISM; known to most people watching the show now, but set at a time when this would be an earth-shattering revelation to the general public.
Also the Operation Genoa story became rather funny when something similar happened with CBS when they had to retract a 60 Minutes report on the supposed "truth" behind the Benghazi attack(the Benghazi attack was ironically a part of the episode "Red Team III" in which ACN retracts the Genoa story) because the informant they used had given out false information and FOX news was left looking foolish since they quoted the CBS report as fact.
Leona. She uses the tabloids owned by ACM to slander Will, in the hopes that it will make it seem like ACM firing him would be completely justified, and also activate his non-compete clause.. Certainly not infallible, though.
Charlie, to a lesser extent, on the side of Good.
A case could be made for Shep Pressman, Charlie's contact for Operation Genoa, who found out Jerry Dantana was snooping around and used the opportunity to give Charlie purposely falsified munitions inventories in hopes that he would run them and be exposed so it would incriminate ACN. His motivation was to get revenge on Charlie for allowing Shep's son to be fired from ACN, which lead to his son's death by drug overdose.
Moral Event Horizon: A journalistic one. Jerry doctors footage from an interview with one of the architects behind Operation Genoa so that it appears that the interviewee outright states that the US used sarin gas, rather than alluding to it. While no puppies were kicked or love interests murdered, the level of "journalistic malpractice" (as Sloan would put it) going on is pretty severe.
Romantic Plot Tumor: Some viewers aren't really interested in any of the relationship plotlines (I.E. Lisa/Maggie/Jim), and even many of those who are consider the Jim/Maggie plotline this trope.
She Really Can Act: Olivia Munn was largely regarded as a lightweight in acting, if that. Then the episode "Bullies" rolled around. Cue a whole lot of people sitting up and going "Whoa!"
Some Anvils Need to Be Dropped: The show justifies its own anviliciousness in a conversation in which the news people assert that you don't have to be "balanced" when the objective facts support only one side.
The How We Got Here story in season 2 started out quite exciting, with the promise that we'd actually get to see the team seriously screw up rather than always know the right thing to say about any news item by virtue of being written two years after the fact. Then it all turns out to be the fault of a new character.
Also the subplot about Will getting death threats in season 1 looked to be building up to something truly interesting, and then it's completely ignored and forgotten about in season 2, with Will's bodyguard Lonnie Church no longer around and no mention of the storyline whatsoever.
What an Idiot: Jerry risks his entire career to get a news story aired by altering interview footage of a powerful Marine general. Even though he did a very good job of altering it, he must have known that the footage would be scrutinized heavily by someone after the general inevitably protests.