Continuity mistake: In the beginning of the show, Cory is showing Shawn something he wrote in the school paper. Cory walks away leaving his backpack on the bench. In this whole scene to the point where Cory says, "Is it just me or is it just me" sometimes he is wearing his backpack, and sometimes he isn't. (00:00:20 - 00:03:05)
Continuity mistake: When Alan is saying "It's a miracle bra, honey, get a camera," his left hand is resting on the table. When the shot changes, his left hand is suddenly resting on his right arm. (00:08:00)
A Long Walk To Pittsburgh (1) - S4-E16
Continuity mistake: After Cory finishes downing his soda, he places the cup on the table. When the shot changes, his hand is instantly away from the cup. (00:16:37)
A Long Walk To Pittsburgh (2) - S4-E17
Continuity mistake: When Topanga comes back to see Cory, for the whole period of time that she is there, sometimes her hair is dry and straight, and others it's wet and wavy. (00:07:12 - 00:21:16)
A Long Walk To Pittsburgh (2) - S4-E17
Continuity mistake: After Cory finishes explaining to Amy why he loves Topanga, he sits down next to her and begins placing his arm around her. When the shot changes, his hand is instantly resting on her shoulder.
Continuity mistake: When Amy is trying to get Alan to back off Mr. Mack, the way her hand is gripping his arm changes between shots. (00:16:45)
Continuity mistake: When Mr. Feeny is asking the class if they have any comments on Cory's documentary, he calls on Angela, and Cory begins turning his head to look in her direction. When the shot changes, he is instantly looking at her. (00:04:12)
Continuity mistake: In this episode Eric said he was 8 months older than Jack, but in '5-17 And Then There Was Shawn', Jack said that he was older.
Continuity mistake: When Topanga is in the elevator and is saying "We'll just have to let nature take its..." the elevator door completely closes before she can say "course." When the shot changes to Cory saying "Nature take its what?", the door can be seen sliding closed again.
Continuity mistake: When Cory is whispering in Amy's ear, she is holding a cup of frozen yogurt in her left hand. When the shot changes, she is holding it in her right hand. (00:16:40)
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.
The Witches of Pennbrook - S5-E5
Continuity mistake: When Shawn is saying "So, Rosemary, how's the baby?" his left hand is resting on a box of household items. When the shot changes, his left hand is instantly raised. (00:10:00)
How to Succeed in Business - S5-E9
Continuity mistake: When Amy shows up in Eric and Jack's creative writing class, her backpack is first shown to be unzipped a few inches wide, and just before she sits down, it is suddenly zipped nearly closed. (00:06:20 - 00:07:00)
A Very Topanga Christmas - S5-E11
Continuity mistake: When Topanga tries the egg nog, you can tell that there is nothing in the paper cup.
Raging Cory - S5-E12
Continuity mistake: When Jack is sarcastically asking Shawn if his room is where what people throw down the garbage chute ends up, they are standing shoulder to shoulder. When the shot changes, there is now space between them. (00:02:25)
Raging Cory - S5-E12
Continuity mistake: When Shawn is talking about how the time Cory beat up his dad will be a great memory, the half of a cracker he is eating suddenly has another half-sized bite taken out of it and his hand is near his mouth. When the shot changes, the cracker is half-sized again and his hand is several inches away from his face. (00:03:40)
The Eskimo - S5-E13
Continuity mistake: When Jack is asking Eric about his date the previous night, Eric puts down the book he was reading with the spine facing towards Jack. When the shot changes, the book has now rotated almost 90° counter-clockwise. (00:03:56)
Continuity mistake: When Cory is saying to Lauren "Well, today I guess you're stuck with me," he slightly raises his left hand and then sets it back down on his left knee. When the shot changes, his left hand is suddenly resting on the couch cushion between his legs. (00:05:03)
Torn Between Two Lovers (Feeling Like a Fool) - S5-E16
Continuity mistake: When Eric is saying "You think I should be a teacher," Mr. Feeny has his hands on his hips. When the shot changes, his arms are down by his sides. (00:15:42)
And Then There Was Shawn - S5-E17
Continuity mistake: When Shawn is grilling Kenny about asking to borrow Topanga's pencil, sometimes there is a female student sitting directly behind Angela with an open book on her desk, and other times the desk is unoccupied altogether. (00:00:21 - 00:02:40)
Answer: Topanga's middle name is never specified. Considering her sister's name is Nebula Stop-the-war Lawrence, Topanga's is probably something equally unusual.