In season 11, ep. 10, when Peggy gets amnesia, Al eventually becomes interested in her again by the end of the episode, and quickly went back to being disgusted by her when she regained her memory. This implies that Al doesn’t find Peggy so repulsive because of her looks (frankly, Katey Segal is a very good-looking woman), but because of her repulsive personality.
It was heavily implied that Al was a major jerk and asshole in high school. The 'Bundy Curse' and his status as an eternal loser, are Karmic justice for that behavior. Al ensures his status in life never changes by continuing to act like a jerk. The more he lashes out about his crappy lot in life, the worse his life is.
Seven appearing on the milk carton was obviously a lampshade, but in-universe, this means Seven just went missing one day and nobody cares about finding him! (And no, this isn't Fridge Horror, since that term implies that somebody out there would be horrified by the idea of Seven going missing.)
Al Bundy peaked in high school, Polk High. James K. Polk is remembered for fulfilling all of his campaign promises in his first term, not seeking a second term, and promptly dying shortly after leaving office. Like Al Bundy, Polk peaked early and then crashed.
Kelly has many groups of friends, who change in almost every episode that they appear. You may wonder why, but then "The House That Peg Lost" implies a reason; she sleeps with all their boyfriends.
"Peggy Turns 300" gives us what might be Al's greatest loss in life: Bowling. While trying to get the record, Peggy starts to bowl and reaches a perfect 300, which throws Al into delusions of being a winner. Fans of the show might have gotten a hint to this outcome from the name of the record holder Al was trying to beat- Puggy Weaver. Peggy Wanker was clearly set to win from the start.
Every car in the series that gives Al some sort of grief is colored red. The Mustang he and Steve restore? Red. The Jeep that runs over his foot when he was a gas station attendant? Red. The New Allante? Red. The Dodge Viper he missed out on winning? Red. The New Testica? Red. Even his trusty Dodge, after a hard scrubbing in the car wash, was discovered to be Red. What color does he despise because it reminds him of his Peggy's hair? RED!!!
In "Hot Off The Grill", Al mentions how Labor Day is the day for the working man. Fittingly enough, everyone who had a job had a fantastic Labor Day. Al enjoyed his barbecue and got his family to follow orders for a change, Marcy bonded with Al and never found out her aunt's ashes were in the burger, and Steve got to get some payback on the aunt he detested so much. The people without jobs (Bud, Kelly, and especially Peg) had a miserable Labor Day.
In their first Christmas episode from season 2, "You Better Watch Out", after the Santa Claus who accidentally fell to his death is taken away, his bundle of mall certificates fall off the roof and the Bundys soon take the whole bundle with them to spend for themselves for Christmas. Not only do the merchants at the mall have the right to refuse the family to use all of the certificates, but even worse, upon realizing that the guy they hired as Santa is dead, they could be accused of killing him just to steal his money!
In one episode, Kelly strips a girl named Heather McCoy naked and exposes her to her entire school as revenge for Heather tricking Bud into stripping. Aside from the trauma of being exposed, Kelly was unlikely to have somehow tricked Heather into stripping and tying herself up (and even less likely to have convinced Heather to willingly participate to atone for bullying Bud), so she likely forcefully pulled Heather’s clothes off her. Or attacked her and dragged her out to the hall while she was showering.
Seeing that Kelly never got into trouble, either Heather inexplicably forgave Kelly, was too scared to press charges or did so but was unsuccessful.
