Revealing mistake: While they are jousting, there is no one at all next to the stage in the wide shots. Every time they show the stage up close, there are 40-50 people. It changes back and forth the whole scene.
Continuity mistake: At the airport outside, Marcy yells at Jefferson and knees him. While she does that, there is a man wearing a white coat walking behind them. Camera instantly changes and there is no man at all in a white coat. In fact, there is now a woman wearing a white coat.
Poppy's By the Tree (1) - S2-E1
Continuity mistake: Bud asks to go down to the high school "tomorrow" to meet the man who met Andy Griffith. Earlier Al reads the events page in newspaper. The event was said to be "tonight."
Girls Just Want to Have Fun (2) - S2-E6
Continuity mistake: When sitting on sofa with Marci, Peg's necklace falls beneath her red blouse. It remains under in most shots, but in the last shot it is outside her shirt.
Weenie Tot Lovers & Other Strangers - S5-E18
Continuity mistake: When Al asks for the checkbook to write a check for Bud, Bud puts his right hand on Al's left shoulder. Next shot, Bud's hand is coming off Al's right shoulder.
I'll See You in Court - S3-E10
Continuity mistake: While they are in court, Steve is talking about the case and the clock says 12:30. Next time he's seen and talking about privacy to the jury, the clock says 11:30. Then when done talking, the clock says 3:00. The very next scene as the court proceedings are going forward, now the clock says 12:29. Next scene says 4:32. Than backwards again. The clock is moving forward and backwards throughout the entire scene.
Continuity mistake: When Kelly is at the grill, right after being called a "dullard" by Bud, Kelly grabs Bud's wrist with her left hand. As we pan out on the exact same scene, her hand is nowhere near his wrist.
Frat Chance - S7-E6
Continuity mistake: When Bud is talking about this being the year he will get a real girl, he drinks from the carton of milk and spills some on his shirt. Next time they show him the spot on his shirt is dry. The next it's wet again, and it goes back and forth for the entire scene.
She's Having My Baby (1) - S6-E1
Continuity mistake: In the prior episode, when Peggy tells Al she is pregnant, Jefferson just smiles at Al after she tells him. In this episode, at the beginning, when Peggy tells Al she is pregnant during the recap, Jefferson smiles at Al but also pats Al on the shoulder.
Continuity mistake: When Kelly blows up the car near the end, when they show the car before it explodes, you see someone walking on the right side behind the car. Half a second later the car explodes and now someone is walking by the building on the left side of the screen. There wasn't anyone there before.
Revealing mistake: When Kelly is at the house of the crazy guy who made the couch, when they drink the cappuccino and he throws the cup, it's clear that the cups are just props as the drink stays in when it falls towards the camera.
Other mistake: Bud calls a late night sex hot line which is a 1 900 number yet he only pushes 6 digits on the phone.
Deliberate mistake: Why would Al have his Polk High football uniform in England?
Suggested correction: Al cherishes his memories as a high school football player. It's quite possible that he takes the uniform with him on some trips, especially when going to another country. I've known people who do this with items that are important to them; i.e. a jewellery box or a favourite picture of family. They feel better keeping the item with them, in case something happens at home while they are away.
Peggy Loves Al, Yeah Yeah, Yeah - S2-E17
Other mistake: When Bud goes upstairs with his fake bag of "Valentines" (actually a bag filled with bottles), Kelly begins to look through some from her bag. Behind her, you can see David Faustino (Bud) purposely moving slowly up the stairs because Christina Applegate (Kelly) is about to find the envelope that is addressed to Bud.
You Gotta Know When to Fold 'Em (2) - S4-E17
Factual error: Bud and Kelly wouldn't be allowed to go in a casino in Vegas because they are both under 21.
Other mistake: When Peggy throws the final ball, all the pins fall except for one and the sweep bar comes down. It is then shown wobbling down without the sweep bar in play. This is an illegal drop and would not count under any PBA sanctioned tournament or in any bowling alley in the United States. The bowling alley would credit her with a 299, and Al would have a chance to get a 300.
Visible crew/equipment: When Marcy announces they only have time to grab their most precious personal possessions Kelly notes her own, and in the next shot the boom mic makes a happy appearance at the top of the screen. (00:07:45)
Revealing mistake: Marcy dries her dress in Peg's dryer. She comes downstairs with it on looking like it shrank. You can plainly see Marcy put on her belt and pulled up her dress to make it look shorter.
Factual error: Griff's shown being strapped into the electric chair. Problem is Illinois had stopped using the electric chair and switched over to lethal injection in 1983.
Other mistake: Al, Peg, and the kids go to the beach. Steve and Marcy are sitting not too far away from them, yet they never interact with each other. They had to see each other they just act like they don't notice each other.