In one episode Joey goes to amateur night at a comedy club, but gets interrupted by Phyllis Diller who takes his place. It may seem like a random guest star until you know that Diller lived in San Francisco for part of her adult life.
When DJ gets her first car, Danny plays the song "The Horn Went Beep Beep Beep" on the guitar. It may look like Danny looking like a dork, but in a previous episode he had an attachment to his old car and the song had some meaning to him.
Danny being able to buy a new car in a season one episode, renovate the entire basement twice, as well as take vacations (when his roommates don't pay rent and he lives on a local TV newscaster's salary) makes more sense if his late wife's life insurance paid for it.
Becky announces she's pregnant in the season four finale, which is set in May. It's also established she has the twins in November. This might seem like a standard TV pregnancy, but her and Jesse got married on Valentine's Day in February. The twins were conceived then.
Why is Danny obsess with cleaning when in earlier episode he is very reluctant to do so? It is because in that same episode Danny state Pam took care of that and so the reason why he go out of his way for cleaning, it is his way of recreating being with his wife.
There's a theory men are attracted to women who remind them of their mothers, this is why Danny dates Gia's mom in the last season. She's divorced, a single mom, and her name is Clare just like Danny's mother.
In a first season episode Joey gets the chicken pox as an adult and says he never got them as a kid. In the episode when he reunites with his dad, his dad tells him he had the chicken pox as a kid and he watched cartoons with him until he got better. It's possible to get them again if you had them at a very young age. Joey's dad is an authoritarian, which Joey resents and it's possible it happened when he was too young to remember it, hence why he doesn't remember them watching Popeye together.
Jesse is Greek, thus his sister, the girl's mother Pam, would have been too, yet in a home movie Pam is shown to be blonde. It's odder still that the girls would then be half-Greek and their dad has dark brown hair, yet they all have light hair.
One episode had the family's Greek relatives visiting and all of them were brunettes, which only adds to the confusion.
Clearly Pam has dyed hair and Joey is the girl's real father.
Originally, the Katsopolis family was Italian. Don't know if that helps.
In 7.10 "The Prying Game" Danny mentions that Jesse is half-Greek, making the girls and the twins only one-quarter Greek. Still doesn't explain Pam's blonde hair or how all 5 children in the house inherited blonde hair too.
Don't forget the twins having blonde hair. Me thinks Becky had an affair with Joey.
Some Greeks have blond hair— Cleopatra, for instance was a Ptolomey (Greek dynasty in Egypt) and some believe she was blond and green-eyed. Not to mention, a lot of different genes contribute to hair color, so it could be recessive or something.
I have a cousin who is half Greek and his daughter has sandy blonde hair.
Jesse loves classic rock, especially Elvis. In one episode Danny wanted to sing "My Generation" by The Who with the band for a school function. Jesse said the song wasn't hip enough. Why would he object to that when he sings Elvis and other hits from the 1950s and 60s?
He's an elitist douche who considers himself the final arbiter of cool, that's why. He only says it's not hip enough because Danny, king of the lame, suggested it.
Twice Jesse's band is unavailable, and he's left with undesirable alternatives, The Tanners in one instance, a marching band in another. Why didn't he think of doing an acoustic set? Especially since he owns an acoustic guitar and clearly that'd be better than having a freaking marching band
Both were spur of the moment. Jesse probably wanted a band to live up to his word.