Bums: Making a Mess All Over the City - S3-E14
Continuity mistake: When we see the cop car, none of the black panels have markings on them. When we see the car burning at the end, the rear black panels have markings on them.
Dennis and Dee's Mom is Dead - S3-E3
Continuity mistake: At the beginning, when we first see Dee, her tray doesn't have any bottles on it, but in the next shot, she now has at least 2 bottles on the tray (next shot we see 3) from cleaning up that should wouldn't have had time to pick up.
Charlie Goes America All Over Everybody's Ass - S2-E9
Continuity mistake: At the beginning, the position of Dennis holding his cigarette changes between shots. For example, when Dee says "thank you", Dennis is putting the cigarette down, and then in the next shot when Charlie walks in, Dennis has his hand back up and is putting the cigarette down again.
Continuity mistake: When the Flip Flop Kid comes up to Dennis with a soda, it's in his left hand. It then switches to his right hand in the next shot. When he turns away to do his lap, it's in his left hand again.
Continuity mistake: In the waiting room of the hospital, you can see over the shoulder of the woman, and she's reading a magazine, but when the camera angle changes, she's holding a newspaper. It switches back to a magazine in other shots of her.
Charlie Wants an Abortion - S1-E2
Continuity mistake: At the beginning when they're making fun of Charlie, Mac is holding the ball against his body. In the next shot he's holding it up in his hand. It switches back and forth Then he's no longer holding the ball.
Chardee MacDennis 2: Electric Boogaloo - S11-E1
Continuity mistake: In the long shot of Frank's flag being raised, it clears the beer mat holder, then we cut to a closer shot and the flag is lower and gets raised up again.
Mac and Dennis Buy a Timeshare - S9-E4
Continuity mistake: When Dee and Charlie find Frank stuck, his arms are in different places depending on the camera angle.
Continuity mistake: The plane that Dee gets onto has winglets and a dark blue/black stripe around it. When seen flying in the next shot, the plane has no winglets and a red stripe.
Reynolds vs. Reynolds: The Cereal Defense - S8-E10
Continuity mistake: As Dee says "I would like a five with my client" she puts her arm across Dennis' arms. Shot cuts to the side and both her arms are clasped in front of her.
Mac and Dennis Break Up - S5-E9
Continuity mistake: The liquid stain on Dennis in the restaurant suddenly becomes much smaller when he offers to pay Mac's tab, then gets larger again as he smiles.
The Gang Gets Invincible - S3-E2
Continuity mistake: At the start Charlie's fairly clean-shaven, then when they all sit in the park after agreeing to get some fresh air, he's got his usual beard / heavy stubble.
The Gang Solves Global Warming - S14-E10
Continuity mistake: When the bus drives off, Charlie is with his hands on his hip and he's holding the empty bag in his left hand. In the next shot, his left hand is by his chest and he's holding the string of the bag and the bag is over his shoulder.
The Gang Wins the Big Game - S13-E9
Continuity mistake: When Uncle Jack is filming Bill drink a beer, he is holding it horizontally. When the shot cuts to what the phone sees, the video is shot vertically. When it cuts back to Jack, he's still holding it horizontally. (00:01:06)
Time's Up for the Gang - S13-E4
Continuity mistake: After Dennis concludes with his presentation, everyone stands up, including Dee. In the next shot, everybody but Dee is standing and Dee is now getting up again. (00:19:24)
Continuity mistake: When Cricket's dad walks away with Tom, Cricket heads towards a wide open door behind Davy. When Davy calls him, he turns around and says "what" and the door is now closed. (00:13:48)
Continuity mistake: Dennis and Charlie drop their cigarettes into a mug on the desk, smoke still billowing. In the next shot, there is no smoke at all. (00:11:28)
The Gang Gets Romantic - S14-E1
Continuity mistake: While Mac speaks to Greg and Lisa, Dennis instantly moves from being in front of the kitchen sink, then off to the side of the sink.
The Gang Gets Romantic - S14-E1
Continuity mistake: In the bar, as Charlie explains the situation with Dee, Dee's hands instantly change positions as the shots change.
The Gang Gets Romantic - S14-E1
Continuity mistake: When Lisa suggests getting another room, she is facing her husband on her right. The next quick shot and she is facing away from him.