Continuity mistake: Sue says that she "matured" aka got her period, on Sept 21, but in the episode "Forced Family Fun", when they go camping and she gets it, they go before school starts, which is well before the end of September.
Continuity mistake: Axl and his friend chase Darren out of the house and into the snow, churning a path in the snow. However, in the overhead shots of all three boys, the churned snow path is not there, just undisturbed snow.
Continuity mistake: Nancy Donahue refers to her husband as "Joe." Throughout the remainder of the series, his name is Ron. (00:03:45)
Continuity mistake: As Frankie excoriates her family for not noticing she was not on the train, her purse switches from her left to right shoulder and back again.
Operation Infiltration - S6-E18
Continuity mistake: In Mike's brother's room, the street sign above the bed changes from Main Street to First Street, then back to Main Street.
Continuity mistake: While Mike is explaining to Frankie his inaction to help Frankie, the red blanket draped over Frankie's shoulder goes from being on her shoulder, to off, then back on between shots.
A Very Marry Christmas - S8-E9
Revealing mistake: As the Hecks check out the neighborhood Christmas lights, the same house with the same decorations are seen through Sue's side of the car several times, showing the background scenes of the house and decorations were replayed.
Continuity mistake: When Frankie is going crazy lying on the floor because of all of the stuff still in the house, objects move around as the camera shots get closer to her, look at the VHS tape on her left.
Halloween VI: Tick Tock Death - S7-E6
Continuity mistake: Mike is holding and looking through Brick's Halloween bag when Brick wanders off to the next house and encounters Cindy. When he walks back to where Mike is, Brick is carrying the bag.
Factual error: Sue's birthday isn't actually on Leap Day as this birthday is her 15th (in season 4 she celebrates her Sweet 16) and Leap Day birthdays are multiples of 4. The closest leap day birthday in this sense would be her 16th.
Continuity mistake: As Sue is freaking out about the reviews, she makes a lot of eye contact with a customer. As she is doing this she makes a large orange soda. In the first angle, she takes out 2 cups to pour the soda in, but in the second shot when she puts it down, it's only one cup. (00:11:50)
Character mistake: When Sue and her opponent switch sides right before her opponent smashes her racket, the score in games is 5-1. In tennis, you only switch sides when the sum of games is an odd number (4-3, 5-2, 1-0) for example.
Other mistake: When Brick first goes to see Betty White in the library, she gives him until Walt Whitman's birthday (May 31st) to return the books. When he returns and realises he is still short 1 book, she gives him until Sir Arthur Conan Doyle's birthday which is May 22nd - before Whitman's birthday.
Last Whiff of Summer: Part 1 - S4-E1
Continuity mistake: After Axl spills milk on himself, he goes from being wet to dry and back and forth in the rest of the scene.
New Year's Revelations - S9-E11
Continuity mistake: Brad's socket and socket wrench change positions several times on Sue's bed as the scene cuts.
Continuity mistake: While Axl's in Sue's dorm room when she's getting ready to leave, Sue puts one of the backpack straps over her shoulder, then in the following shots it goes back and forth between having only one or both straps over her shoulders.
Continuity mistake: When Frankie finds a shampoo bottle in the middle of the garbage, she puts it under her arm, and then it disappears.
Continuity mistake: When Frankie gets her breakfast spilled on her shirt, it goes from a bit stained to really stained on its front.
New Year's Revelations - S9-E11
Continuity mistake: Frankie's hand changes position several times while eating the baloney rolls as the scene cuts from her front to over her left shoulder.
The Christmas Miracle - S9-E10
Continuity mistake: Frankie's arms are seen at her sides in the frontal views of her as she tries to convince Axel to go to church, but the views from her left rear shows her elbows bent, indicating crossed arms.
