Twyla reveals that she already knew that Elevation is a cult, but was willing to make a bunch of purchases just to support Alexis. In the penultimate episode, it's revealed that Twyla is Secretly Wealthy but doesn't spend the money on herself. She could easily afford the merchandise, and helping Alexis was something that made her happy.
When Johnny and Roland go to apply for a bank loan in Season Six, a young Black woman turns down their loan but does mention that Roland once dated her mom. This recalls the first season, when Johnny applies for unemployment and the woman who at first turns him down is a Black woman who is an old paramour of Roland's. One presumes that the bank loan officer is her daughter.
Johnny bought Schitt's Creek as a gift for David. David is the only one in the family who ultimately stays in Schitt's Creek and makes a permanent home there.
"Yeah, the actual longest relationship was a three month affair with a Saudi prince, but for the last two months of that I was trapped in his palace trying to get to an embassy."
"Do I have to remind you of the time that I was taken hostage on David Geffen’s yacht by Somali pirates for a week and nobody answered my texts?”
"I didn’t go missing, David. The FBI knew where I was the entire time."
"You learn pretty quickly when you’re in a Ugandan diamond smuggler’s villa, playing for your friend’s freedom.”
When Jocelyn bullies David into throwing her Baby Sprinkle, she says her sister could not do it because of her husband's heart problems. Later, Roland mentions that Jocelyn threw her brother-in-law's funeral for a very modest amount.
Although David and Alexis's childhoods are almost always Played for Laughs, some of the stories can be a mix of Fridge Horror and Fridge Sadness, such as Moira teaching her (implied to be quite young) children to throw prescription pain pills into her mouth as a game and getting high enough that she no longer remembers playing. As the show goes on, it becomes clear that their upbringing contributed heavily to their insecurities and difficulties in forming healthy relationships.
Alexis's sexual past is generally portrayed in a positive way, with her having little shame about her enjoyment of various lovers. However, if you do the math, she would have been about 13 when she dated Sean Penn and he wasn't her First Kiss. Her first kiss was with Jared Leto, and he is probably about 15 years older than the character so you had Jared Leto and Sean Penn dating Alexis in her early teens when one would have been in his 30s and the other in his forties, at least.
In "Rooms by the Hour," Moira offhandedly mentions that she was pregnant with David "for almost a full seven months." If true, this would place David at 27 weeks or less at the time of his birth, which is considered extremely preterm. While survival rates for infants born earlier than 28 weeks have been improving over the last few decades, having a premature newborn in the NICU can't have been an easy experience for Johnny and Moira, especially in the 80s when several modern-day advancements for premature babies were either fairly new or still in development.
On Alexis's first day as the secretary at Ted's vet office, she connects with a patient in the waiting room who's worried about her sick cat. Ted tells her that the woman's been in the office once a week for two years, obviously excessively worried about that cat—and then in the next scene, the cat has died in Ted's exam room. Maybe he shouldn't have discounted her concerns...
