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In "House of Cards" (among other episodes), it was stated that Kim was Greg's first girlfriend.
Greg tells Kim, "All through high school, the only rack I ever saw was the one that was holding my letters." But, in "Johnny Ampleseed," he mentions that he slept with Stacey.
Billy's last name is finally mentioned: Colavita. Couple that with the middle initial seen on his nametag in "Speed Dating," and we just about have his full name: Billy R. Colavita.
In "Jimmy's Jimmy", although Billy already knew Kim, Jimmy introduces Billy and Greg for the first time. In the wedding video from this episode, they've already met. "When Jimmy Met Greggy" has a similar goof.
Pat Harrington Jr. says, "May 3, 1994. To most people, that's just another Thursday morning." May 3, 1994 was actually a Tuesday.
In the first scene of Act I, the red candle holder changes position on the coffee table from shot to shot.
The outside of the bar and grill where the gang eat at has a storefront sign that reads "Blue Lou's" (a place that really exists). Meanwhile, the cover of the menus they're using inside the restaurant read "Earl's."
Jimmy's orange juice bottle changes position from shot to shot while he's reading the newspaper.
The first name of Greg's white co-worker was Steve the first time he appeared (in "Home Is Where the Heart Isn't"). Here, it's Mike.
After Logan rolls the dice the first time, one die changes position from shot to shot without anyone touching it. And while Greg is talking to Jimmy and the kids, after Logan rolls the dice a second time, one die appears, disappears and reappears again.
Near the end of the episode Jimmy says that Sammy should not come to dinner with them because he breaks stuff and lies about it. Sammy did not lie about anything. He did not say a word the whole episode.
The end montage is the same sequence that has been featured in several past episodes.
The policeman stated that he had planned to order "a couple of dogs with relish." In the state of California (and elsewhere), it's illegal for motorized vendors to operate business in traffic, even under standstill conditions.
The eleven former Big Brother contestants all prove to be remarkably good sports, each one making fun of their TV personas: Alison (crying copious crocodile tears), Jun (hating everyone), Nathan and Hardy (obsessed with physiques), Will (chest shaving), Amy (eating cheese and drinking booze), Marcellas (catty fruit), Michelle (mute eye candy), Justin (clingy), Roddy (gay for pay), Lisa (man toy).
The three books that Greg buys for Jimmy are not real.
In the scene where Greg confronts Jimmy and Christine about his parenting, you see Jimmy lean up and sit on the edge of the couch. In the next shot Jimmy is leaning back with his feet up with his arm around Christine.
In the Season 1 episode "Jimmy's Jimmy," it was clear that Billy and Greg had not met before. Now, it turns out that they had.
In this episode, along with "House of Cards," we learn that Kim was Greg's first girlfriend when he mentions that he never had a girlfriend all through high school. But in "Johnny Ampleseed," he did have at least one: Stacey.
Jimmy comes to realize that he's dumb at math and science, but Dominic helps him realize that he's a smart mechanic. However, when Dominic asks, "What's that?" on the lawn mower, Jimmy says it's a distributor cap. That mower wouldn't have a distributor cap; there wouldn't be enough cylinders.
Greg remarks, "Up to the age of seven, I couldn't figure out why I had a box of sixty-four gray crayons." Contrary to a common misconception, almost all color-blind people merely experience difficulty or inability to distinguish between specific colors, not a thorough lack of color perception. The condition that Greg describes (total color-blindness, also known as complete achromatopsia or rod monochromatism) is a very rare hereditary disorder -- requiring the passage of defective genes by both parents -- and is accompanied by significant visual impairment and extreme light sensitivity. (In addition to seeing poorly, its sufferers squint in even low-light situations.) Conversely, Greg demonstrates normal visual acuity, along with the ability to spend hours outdoors in direct California sunlight without even bothering to wear sunglasses.