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.
Epileptic Trees: These will inevitably result now that 3 people's flashforwards have been revealed to not match up as neatly as first suspected — Zoey saw what she thinks is her and Demetri's wedding, but he is supposed to be dead by then. Aaron saw his daughter, but DNA evidence confirms she is already dead as well.
...and what if a flashforward of someone who died in the blackout turns out to be important?
Fridge Brilliance: In "The Gift", Al Gough sacrifices himself to keep a woman from dying. In "Course Correction" the head of the LA Blue Hand group, Raynaud, turns out to be after the same woman to kill her to make certain her death comes true. If this had never happened, Celia would have lived due to Al's Tear JerkerHeroic Sacrifice.
Fridge Logic: In "Queen Sacrifice," it's revealed that Dyson Frost has had many, many flash forwards and knows all sorts of detailed stuff about the future, and particularly about the Mosaic investigation. If so, why does there need to be a mole inside Mosaic at all, much less two of them?
Near the end of the episode, Frost contacts Mark and informs him that he can now meet up with him and talk more freely seeing as the "mole problem" has been taken care of. It appears that the moles aren't his.
It's been shown that the Flash Forwards aren't certain, only possibilities. Things might play out one way or another, and he needs to know which.
Plus, your Flash Forward is only about what you will be doing at time X; you can't see or acquire knowledge about anything or anyplace you won't be or don't have access to.
That kangaroo is still running around in the series finale! How the hell did no-one do anything about that kangaroo in six months?
Well, during Hurricane Andrew, much of Miami Metro Zoo was destroyed and lots of animals escaped. Some, including a giraffe were never recovered. Dead or alive. If you can lose something as big and prominent as a giraffe, a kangaroo is child's play.
Harsher in Hindsight: Al's suicide after his actor Lee Thompson Young committed suicide himself in 2013.
Ho Yay: The first LINE of the show is Mark bellowing "DEMETRI!" Seriously, waking up after a catastrophe and Demetri is the first thing you think of?
Some between Simon and Lloyd. When Lloyd asks Simon is there was anyone he ever truly cared about, Simon looked at him rather shiftily and then changed the subject.
One-upped in 1x19, when Simon apologizes to Lloyd for keeping him in the dark re: his sister's kidnapping, and goes on to say he's the only friend Simon's got. Lloyd responds with what looks suspiciously like reluctant fondness and takes him out for a drink.
Lloyd and Mark, especially during "Blowback." This may be Foe Yay, however.
Holy Shit Quotient: The last minute of every episode, tops, and you have what's called a "Last second plot-twist." Genre Savvy-viewers are instantly alerted to the impending plot point as soon as the camera cuts that last time. The only time the "last-second plot twist" was averted was during "Blowback," which chose to devote the time to a Crowning Moment Of Awesome instead.
The doll factory and the children singing "Ring Around the Rosie".
The whole concept arguably counts. Just imagine being the patient who died during the blackout because his doctors were unconscious. Or one of the people who was in the bus that drove into the lake or the planes that crashed. Just such a random, pointless and helpless way to die. Just try to imagine the mind-bogglingly high number of people just driving in cars at the moment the Blackout strikes - all around the world! Or for that matter, all the people who are swimming, climbing...
What Do You Mean, It's Not Symbolic? - The New York Times review of the pilot included a list of historical events tied to the flash forward date of April 29, 2010, and suggesting speculation over the date's significance would be more fuel for Epileptic Trees. In actuality, it's just the 50th birthday of Robert J. Sawyer, author of the Flash Forward novel, which coincidentally falls close to the airing of the first season finale.
Bryce: The poor bastard contemplates suicide because he's got terminal cancer, Stage 4 Renal Carcinoma, then sees himself in his flash forward meeting a beautiful Japanese girl (Keiko) with whom he is apparently in love, then spends an episode trying to find her in Japan where he actually DOES figure out who she is and where she lives, only to have her angry mother disavow any knowledge of her and goes back to LA a dejected wreck. And did we mention he has CANCER so he's dealing with the dreadful side effects of chemotherapy??
Keiko: Can't catch a break: she gets a job at a prestigious Japanese company, only to be treated as little more than a waiter to serve tea (she's an engineer) since they won't hire another woman just to serve tea. She quits in disgust, causing a rift with her family who thinks she's being ungrateful. Goes to America, gets a job as a Wrench Wench at an auto garage with a tough-but-friendly guy who tries to make her feel at home, gets swept up when ICE raids the garage under suspicion of hiring illegals, is put into the system and bound for transport back to Japan.
Al Gough. Suffering from guilt over killing a woman he's never met; he decides the only way to change this fate is to kill himself. The letter he writes just breaks your heart.