Continuity mistake: In the first episode Sabrina can't see her mom or she will turn into a ball of wax for the next two years. Then she can't until she gets her witch's licence. Then she never can.
Suggested correction: She was punished, remember?
Revealing mistake: It is very easy to tell when Salem is a real cat and when Salem is a robotic cat.
Other mistake: In this episode, the Spellmens and Salem are sitting at the breakfast table. You can see Sabrina has a stack of pancakes in front of her. But in the episode Pancake Madness, they are forbidden in the Spellman home because of the effects that come from them.
Suggested correction: In the pilot, Sabrina is not a full witch so the pancakes probably had no effect on her. Besides, since she didn't know she was a witch yet, it would be hard for her aunts to justify not letting her have pancakes.
But why were they on the table in first place then?
Continuity mistake: When both Libby and Jenny give a flier to a guy in the gym, in the next shot the guys hands are empty and the fliers have vanished. (00:02:10)
Continuity mistake: When Mr. Pool is scribbling down the formula to turn lead into gold on the blackboard, during each shot the appearance of the writing is different. (00:05:25)
Continuity mistake: After Mr Pool has dropped his briefcase and everything falls out, as Sabrina helps tidy, between shots she is holding yellow papers, then suddenly a pink file. (00:20:35)
Dream Date - S1-E6
Continuity mistake: After Hilda and Zelda make the dream guys out of dough, when Hilda's guy gets up, the sheet he was under falls off the table. Later it suddenly back on the table, then instantly off again. (00:10:40)
Third Aunt From the Sun - S1-E7
Continuity mistake: As Mr Pool is writing 'Dermus' on the blackboard, the amount of word he writes and the appearance of it changes during shots. (00:02:10)
Third Aunt From the Sun - S1-E7
Visible crew/equipment: When Sabrina is singing the Funky Song, you can see the fake room in which this scene was filmed. (00:18:35)
Geek Like Me - S1-E9
Continuity mistake: When Harvey sits down with the burger on his tray, between shots a pile of chips appears by the side of the burger. (00:03:10)
First Kiss - S1-E17
Visible crew/equipment: At the end of the episode when Harvey hops away, a boom mic is visible. (00:21:55)
Continuity mistake: When Sabrina and Valerie are in the cafeteria sitting at the table Valerie is holding her drink, the shot changes and she is now holding a spoon. (00:05:30)
Continuity mistake: At the beginning, after aunt Zelda casts a spell to prevent Sabrina conjuring pancake batter, no sparks or noises come out from her fingers.
Suggested correction: 95% of the time nothing comes out of her finger.
Nobody Nose Libby Like Sabrina Nose Libby - S3-E9
Other mistake: After Salem and Sabrina are shrunk down into the toy plane you see the kitchen from inside the cockpit, but when they are shrunk down to be tiny enough to go into Libby's nose, the view from inside the cockpit is the same as it was before they were shrunk down even further. Since they are that much smaller everything should be seen as much bigger.
Continuity mistake: When Sabrina comes back from dream dropping on Harvey, there is a picture of her on her family secret board. Later after her aunts try to get her to solve the family secret, she says she got a new clue. It was the picture of her and she hung it on her board.
Dream a Little Dreama Me - S4-E2
Other mistake: When she sees Katrina at her house she asks her aunts if she can solve the family secret. But in season 3 episode 25 she already solved it.
Factual error: Hilda says "if they had listened to me instead of that dufus Caesar..." but that would make her over 2,000 years old when she is younger than 700.
Suggested correction: They have a clock that can bring back figures from the past. And did I mention that she can bring back whoever she wants because she's a WITCH?