Other mistake: In this episode, Peggy is terrible at gardening. In the fourth season, she brought flowers to the man who was making foot fetish videos. She said that the flowers were "so pretty" and were from her "own garden."
Other mistake: Dale laughs at Nancy for picking up the diazinon, instead of the bird repeller gel. He then picks up a bag, goes up the ladder, and when he turns the bag around, it says diazanon on the bag he picked up. The only gel in the scene was what Nancy picked up.
Continuity mistake: Peggy's sitting on the couch in her teacher's garb. Yet moments later when she and Bobby rush outside she's back in her usual outfit.
Deliberate mistake: Luanne gets pregnant at the end of season 10 and gives birth in this episode. However, despite the passing of several months being implied through various storylines in the interim, she does not have a pregnant belly until this episode. The rest of the time her stomach was as flat as it usually is.
Lucky's Wedding Suit - S11-E12
Plot hole: In the previous episode, Bill had completely bulked up and then suffered a ruptured rectum, which would sideline him for six months. He remarks that by the time six months pass, all his muscle growth would be gone. This episode shows him to be back to his regular physique, and given the fact that it was established earlier in the season that Luanne was pregnant, the fact that she has no visible baby bump (her belly is still completely flat) suggests six months have not passed, meaning Bill could not have reverted to his flabby physique so quickly.
Bills are Made to be Broken - S4-E3
Continuity mistake: When Hank and Bill are sitting on the hood of Bill's car and talking, one shot of the football field shows it to only be about 70 yards long between the end zones.
Continuity mistake: Hank, Bobby and Peggy are eating at Sugarfoots. On their table, there is a mayo container. Peggy starts talking, and then it shows a close-up of Hank. Then there is a shot of the table again. This time, there is a mustard bottle in the same position and shape as the mayo. The mayo is gone.
Meet the Manger Babies - S2-E12
Continuity mistake: While Hank and his friends are watching the game, right before Bill says, "Yes! Made it to the commercials!" he wipes his hands on the couch and leaves a mess on it, but when he is imitating the football player's touchdown dance, you can see that the mess is gone.
Three Coaches & a Bobby - S3-E12
Continuity mistake: When Hank sees Coach Sauer driving his car on the field, you can see Sauer's car has a red front bumper. When we see the front bumper again a few shots later it is grey. (00:15:30)
Three Coaches & a Bobby - S3-E12
Continuity mistake: If you look carefully during Coach Sauer's training run while Bobby is running down the stands, you will quickly see the mud disappear on Bobby's face and reappear in the next frame. (00:08:35)
Love Hurts and So Does Art - S3-E18
Plot hole: There's no reason Hank or Peggy can't call the deli owner and tell him not to sell any more food to Bobby once he contracts gout.
Suggested correction: Bobby has generally earned his parents' trust. He might get into trouble occasionally, as many pre-teen boys do, but not so much that Hank and Peggy need to cover all the bases. They believe that he stopped going to the deli. As Peggy tells Connie, "He is doing everything he can to get back on his feet in time for that dance."
Continuity mistake: When Dooley is saying "She still wants to dance," Clark is standing next to him and they are roughly the same height. When the shot changes, Clark is suddenly a few inches shorter than Dooley.
Take Me out of the Ball Game - S3-E24
Factual error: Near the end of the episode, Dale Gribble saves Team Strickland by catching a home run ball, hit by Kurt Bevacqua, with his hat. This wins them the game. However, according to the MLB Rulebook, if a player catches a fly ball with their hat, the batter takes three bases, meaning the game would continue and Bevacqua would be at third base. (00:21:00)
The Unbearable Blindness of Laying - S2-E11
Continuity mistake: The sliding glass door at the Hills' house leads into the kitchen. On the wall next to the door is the chore list and a cutout of the state of Texas, and sitting on the floor is a trash can. There is also no sign of the kitchen table which sits right inside that door as well. Sometimes a trash can is there, etc. When Hank storms out of the house while rest of the family is opening presents, there is a shot when Peggy comes out after him and it shows back inside the door. Instead of what is normally on the wall to the right if you were looking from the outside in, you see a small dresser and all the wall looks to be either a picture or a mirror.
Character mistake: When Peggy is meeting Lucky's sister at Luanne's baby shower, she mentions that she lives across the street. However, the baby shower is taking place at Peggy's house, as evidenced by the layout of the house and the wallpaper.
Suggested correction: Peggy does live right across the street from Luanne, which is what she is saying. Myrna knows she was at Peggy's house. Since Myrna never met Luanne, she might not know where Luanne and Lucky live.