In numerous episodes throughout the series, on the first floor of the house, there are two staircases leading up to the second floor; one from the kitchen and one in the living room. But on the second floor, there is only one staircase leading down. And it doesn't matter which one they use, they still end up coming upstairs in the same place.
Jesse was supposed to be a High School drop out, however in the episode _"Full House" One Last Kiss (1990)_ when Jesse is at his High School reunion, while he is dancing with his old girlfriend there is a flashback, during the flashback he rides his motorcycle into the gym when his girlfriend says "Jesse, you're going to get in trouble." Jesse replies "I graduate tomorrow, what are they going to do, expel me?" Jesse has also mentioned that he refused to wear his graduation cap because it would mess up his hair.
Crew or equipment visible
In the basketball episode where Kareem Abdul-Jabbar helps Jesse find his "sweet spot", when Jesse tells the family to leave the court and let him try and figure everything out himself. When he's supposedly alone shooting around, he shoots an air ball and a hand appears quickly in the scene, catches and throws the basketball back to him.
Danny is listed as only child for the majority of the series but miraculously in "Too Much Monkey Business" he has a sister and Joey has always had a crush on here. Previously she's never mentioned and after "Too Much Monkey Business" airs, she's completely forgotten and Danny is back to being an only child as he was always portrayed.
When the series begins, Danny is close to 30 and his oldest daughter D.J. is 11 meaning that Danny and Pam eloped after high school yet Pam got pregnant and Danny was able to go to college and get a job as a news anchor after college and have another daughter (Stephanie) after he finishes school. Michelle is born a year before the series airs (1986). However throughout the series Danny and Joey mention that they both struggled to get dates for their senior proms and in the earlier seasons, Danny admits to always liking Pam since junior high but was too shy to admit it.
Even before the garage is renovated into Joey's room, there are two sets of stairs that lead to it. Most of the time, the cast use the stairs on the left, which leads to the kitchen. There isn't anywhere else in the house that the right staircase could lead to, although Stephanie went up it once in Season 2.
In the episode "Producer" Kimmy chastises Danny after Becky gets the producers job and tells Danny "You've been on the show longer". This isn't true since Danny and Becky started on "Wake Up San Francisco" at the same time although Danny had been with the station longer as he was a sports anchor in season 1.