Continuity mistake: The age gap between Eric and Cory decreases as the series progresses. At the start of the show, Cory is in 6th grade and Eric is a high school sophomore, meaning they are four years apart, give or take a few months. By season 3, Cory is in 9th grade (confirmed by dialogue mentioning that Shawn, who is in the same grade as Cory, is 15 years old), and Eric is a senior, leading to an age gap of three years. The first episode of season 4 takes place a couple months after the end of season 3, with Eric and Cory returning from a summer Road Trip, but just two episodes later, Cory mentions that he is in 11th grade, while Eric is still barely out of high school, leading to an age gap of two years.
Cory's Alternative Friends - S1-E4
Continuity mistake: Shawn claims his "sister, Stacey" uses the straightening stuff all the time. This is the only mention of her ever during the entire run of the show; and when Jack joins the show he is established as Shawn's only sibling.
Continuity mistake: Correct me if I'm wrong, but didn't Topanga once call her mother 'Chloe'?
Continuity mistake: When Eric is talking to his tutor in the hallway after recieving an A- on a test, there is a poster in the background for Sex Ed. This changes though, from saying "Sex, Ed?" to "Sex Ed" throughout the scene.
No Such Thing as a Sure Thing - S7-E4
Continuity mistake: In this episode, and a few others, it's stated that Topanga's mother's name is Rhiannon, yet in earlier episodes Topanaga said that her mother's name was Chloe.
Truth and Consequences - S3-E7
Continuity mistake: When they catch Janitor Bud on tape, there is a time clock on the wall. Through the rest of the episode there isn't.
Continuity mistake: At the end of this episode, you see Griff standing with Joey and Frankie. He's wearing a jacket over a pink button down shirt that has a red collar and red accents. He sees a girl, and the camera moves to Joey who stands up on the bench and screams at the girl, then when the camera goes back to Grif, he's wearing a jacket over a plain old faded red shirt. I wonder what happened to the other shirt.
Continuity mistake: Chet says he's spent the last year searching for his wife, but, when he left, Shawn was ending 7th grade and now Shawn is supposed to be sixteen.
Pairing Off - S2-E2
Continuity mistake: At the end of this episode when Eric & Cory are talking about Cory's date, Eric walks from his desk to the bed and we see the bedroom door is open, but when he walks to his desk from the bed the door is then suddenly closed.
Continuity mistake: When the house is shown from the front exterior, there is a window on the left, but when seen from the interior there is a hat rack there.
Singled Out - S4-E7
Continuity mistake: When Eric answers one question, almost the entire group of girls leaves. In the next scene the stage is filled again.
She's Having My Baby Back Ribs - S7-E17
Continuity mistake: At the start, in Cory and Topanga's dorm room, Topanga asks if Cory thinks she is attractive. He says "Of course I do. Come here, I'll prove it" and leans on his side and tilted back. When the shot changes after Topanga starts walking towards the closet, he is suddenly sitting upright. (00:03:29)
Continuity mistake: If you look in most of the scenes, especially the one where she is throwing the stuff out the window, you can see a wall out of the window, but in the scene where Cory comes back from seeing the lady you can see a dresser out the window.
Continuity mistake: In this episode, Turner goes into a room and says it's his bedroom. But in "My Best Friend's Girl" Cory goes into that room and they say it's a closet.
Everybody Loves Stuart - S6-E7
Continuity mistake: Stuart comments on Shawn's shorter haircut in this episode, but it has been that short since the first day of college.
Continuity mistake: Cory and Harley are out in the hallway after the bell rings, and Cory says he should be in history class, then when they are in Mr. Feeny's office, the bell rings again and Cory says his next class is American history.
Singled Out - S4-E7
Continuity mistake: The same girls keep leaving the stage every time Eric answers a question.
Continuity mistake: When Cory first confronts Shawn over kissing Topanga in their dorm room, Shawn is looking through his drawer for a shirt. The shot goes to Cory for a second, then when it goes back to Shawn he's had time to find a shirt and put it on - the shot wasn't off him for nearly enough time to do that.
Everybody Loves Stuart - S6-E7
Continuity mistake: When Stuart is at the counter getting coffee while talking to Topanga, his hands are clasped together or one hand up other hand down between shots.
