Cameron loves costume parties and dressing up Lily for every holiday, yet hates Halloween, the one day where it's normal.
In "Chirp", Jay said that Gloria likes to celebrate an anniversary for everything, including a fight she had with him after he forgot to celebrate the anniversary of their first date. In "Two Monkeys And A Panda", we find out that Gloria fell in love with Jay right after their first fight.
Jay's tendency to snark to his family. It's only when you really look at who and when he snarks do you realize he's not snarking because he's old fashion but because he just doesn't have many people in his family that share his interests and personality. Look at how quickly he became closer to Cam after finding out Cam loved/played football for instance. Likewise, Manny is willing (and wanting) to share in Jay's interests - and again, Jay becomes pretty close to him in ways that perhaps go above and beyond the call of duty.
The end result of Stella's introduction episode is apparent when you remember the Barkley the Dog Butler episode. Clearly, Jay has a thing for dogs.
As of season 5, Barkley resides in Jay's office at work, after Gloria had him stashed in the attic. Now, Jay has a source of stress relief at work, and Gloria doesn't have to put up with Barkley hanging around the house and freaking her out.
In Dude Ranch, When Mitchell wants to prove his masculinity, He and Luke blow up a bird house. The Brilliance in this episode is that while Mitch usually prefers not to do things that are against the law, he also hates birds. He's wrecked his own house on account of a pigeon before, and another bird caused him problems when he was building Lily a princess castle. Now he's blown up a bird's house. Current score in that battle: Mitchell:one, Birds:2.
When Jay accidentally kills Manny's turtle, he tells Gloria that Mitchell used to have a pet bird, who he let out by accident and covered Mitchell and the rest of the room in bloody feathers. As an adult, Mitchell is afraid of birds, probably because of the childhood trauma.
In "Aunt Mommy" Claire remembers offering her eggs to Cam and Mitchell while holding an egg in her hand. Wonder what triggered that memory?
Meta one but all the special episodes that take place outside their homes like Disneyland? Well, who's the parent of the studio that makes the show? That's right, it's Disney. Which in turns means no messy legal issues when it comes to re-showing these episodes or putting them on DVD, etc.
ABC has a history of doing special episodes of their shows in Disney Parks as a form of cross-advertising, going all the way back to Family Matters, Roseanne, and a 2 part Disney World episode of Full House. I'm still rooting for a Heck Family goes to Disney World episode of The Middle...
Luke's disdainful comments about Obama and the police make more sense after hearing his friend Walt's political opinions in "Election Day."
In "Spring a Fling Ding", when Gloria tries to get a confession out of Lily for breaking the glass on her phone by threatening her toys, you can see a hint of fear on Lily's face. For a six-year-old, Lily is rarely intimidated by anyone, and Gloria is usually one of Lily's favorite adults. Why does she go to so much trouble (again, for a six-year-old) to frame her baby uncle Joe for breaking it and try her hardest not to take the blame? Because Lily knows what Gloria's capable of if she gets angry. She probably figured that was her best chance to escape unholy retribution.
In "Message Received", one sub-plot involves everybody in Jay's part of the family struggling with trying something new that they claim not to like, and they all stand around near the climax of the episode staring down their 'something new': Jay is given one of Gloria's mother's blood sausages, Manny is given a pickle, and Gloria has to rub Stella's stomach. They all try on three, and their reactions are hilariously over-the-top - Gloria screams "WHY SO MOIST?!", Manny claims he's gonna be sick, and Jay drinks straight out of a pickle jar to wash out the flavor of the sausage. In the post-plot stinger at the end of the episode, we see Gloria and Manny returning to Stella and the pickles respectively, finding their previous fears not so bad at all, but Jay is nowhere to be seen. It crosses into Fridge Brilliance territory when you realize that Jay's inability to accept something as simple as a blood sausage is yet another metaphor of his inability to accept Cam and Mitchell's wedding, something he and Mitch argued about at the climax of the episode, and unfortunately, splits the two apart to the point of Mitchell uninviting his father to his wedding.
Do the Family never watch their own TV show? They all constantly confess to things they don't want other family members to know, or get filmed doing incriminating things (eg, Phil keeping Claire locked in the bathroom after an earthquake so he has time to bolt a cabinet to the wall like he said he already had). Surely these secrets are going to get found out pretty quickly. Also, they regularly make mean comments about/lie to other friends and family. Surely if you know your friends are on a TV show, you'd make an effort to watch it?
I always assumed it was a documentary - so a film, or a recorded study that wouldn't be televised.
On a broader level, it's just a hold over when the show was intended to be a Mockumentary. The Confession Cam shots are almost like their inner thoughts and imaginings made quasi-real in the same sense that the song numbers in Glee are both real and imagined.
During a few episodes, the different angles of the same scene reveal that there actually aren't any cameras with them. (For instance, when Mitchell tries to chase a pigeon out of his house, the angle of the shot rapidly switches from in front of him to behind him. If there were any cameras with him, we would have seen them.)
Mitchell deliberately left Cameron's last name off of Lily's birth record, instead of giving her a hyphenated name as they'd discussed. His explanation was that he was afraid that Cameron might leave him and Lily after deciding that he couldn't handle parenthood — his name would only serve to remind Mitchell of Cameron's abandonment. This doesn't make any sense. If Cameron had walked out on Mitchell while Lily was a baby, Mitchell could have had Lily's name changed.
It's difficult to change a legal name, so he would have to face that loss through the whole legal ordeal. Plus, if Lily was older (like, in school/aware of her name) it can be confusing an awkward for the child to do so (hence why a lot of kids have different last names than their divorced parent, even if they only live with that parent).
Jay reveals that he met Gloria when she and her sister were in a bar together. Except that sister has been spending the whole episode acting like she's never left her village in Colombia and has no concept of what America is like.