Weiner of Our Discontent - S4-E18
Continuity mistake: When Rodger comes to the table, he takes a waffle from the plate, starts eating it and then puts it on the plate. When Steve enters the room and sits down, the plate goes from no waffle to waffle again.
Continuity mistake: In the pilot episode, during the breakfast scene, there are five donuts in the box in front of Roger before his chair breaks. When he takes one from the box, there are eight. When Francine takes his donut away, there are five in the box again. (00:03:20 - 00:03:50)
Beyond the Alcove or: How I Learned to Stop Worrying and Love Klaus - S17-E7
Continuity mistake: When Francine is arrested for being a menace, one of the police officers does not have a badge over his shirt pocket, but after Francine vanishes in the cloud of smoke, a badge suddenly appears on the shirt. (00:16:35)
The Fast and the Spurious - S17-E13
Continuity mistake: When future Roger announces his upgraded seatbelts, the way some of the double seatbelt straps are crisscrossed changes in following shots. (00:16:55)
Phantom of the Telethon - S4-E7
Continuity mistake: The way Greg holds the volleyball at the start changes instantly. (00:02:00)
Continuity mistake: When Thacker is killed, blood splatters on his campaign posters resting against the couch. When security breaks in and shoots Sturges, the blood on the posters is gone.
Continuity mistake: We see an old lady shoot a yellow arrow at Roger's golf bag. The shot changes and when we see the arrow again it is red. (00:09:35)
Continuity mistake: The vent-hood in the kitchen above the stove/island is always disappearing and reappearing. Sometimes it's there, sometimes it's not. The handles on the fridge/freezer also keep changing sides. Sometimes they are on the left, sometimes they are on the right. And the living room is always changing sizes. Sometimes they open the front door and the couch is right there, and sometimes it's several feet away from the front door.
Continuity mistake: Stan hears Francine's parents at the door, and Klaus is in front of him with a bowl of nachos to the left of Klaus. In a few shots, Klaus's bowl and the nachos switch spots.
Roger Codger - S1-E6
Continuity mistake: During Francine and Hayley's conversation with Father Donovan, Donovan's phone is directly in front of him. When Francine says "Roger was good", the phone has suddenly moved closer to the golf clubs. (00:08:50 - 00:09:30)
Roger Codger - S1-E6
Continuity mistake: Roger oozes gunge on the couch. Some of the gunge goes on the blanket on top of the couch, but when Stan flips the couch cushion, the gunge from the blanket suddenly disappears. (00:03:25)
Roger Codger - S1-E6
Continuity mistake: Just as Bullock rings the doorbell, Roger oozes gunge from the left side and right side of his torso. The gunge from the right side goes on the couch and the left side goes off screen in a direction towards the door. Yet when Stan answers the door, no gunge is visible on the floor anywhere. (00:03:25)
Blood Crieth Unto Heaven - S8-E10
Continuity mistake: When Stan and Francine are first in the kitchen, a record player is briefly seen to the right of the screen. However, when Stan returns to the kitchen after all his dad's items have been put in the bag there is no sign of the record player in the other room. (00:03:15 - 00:03:55)
Phantom of the Telethon - S4-E7
Continuity mistake: When Stan comes in and says that Bullock loved his telethon idea, Roger goes from holding his wine glass to having his arms crossed depending on the shot. (00:06:30)
Phantom of the Telethon - S4-E7
Continuity mistake: After Roger gets his organ, we see Stan by the totals display. However, the donations jump from 382,760 to 382,840 between camera cuts. When we see the donations rise normally, you see the figures morph into the new ones. This doesn't happen on this occasion. (00:10:00)
Continuity mistake: After the last school day has ended, Stan chases Steve into a canyon Terminator 2 style to show him camp brochures. After Steve has a go at Stan about not wanting to go to camp, Francine enters the scene, knocking Stan's car out of the way. The car is almost ten meters away from Steve and Stan as she enters the scene. Francine doesn't move the car in the next shot. But in the next shot after that, the car is suddenly right next to Steve and Stan. (00:01:15)
Continuity mistake: The way the glass is shattered keeps changing between shots when Bullock jumps out of the diner window. (00:19:35)
Continuity mistake: When Stan leaves the scout rangers, standing behind the door are Steve and Joey the scout. The next shot shows only Joey standing behind the door. (00:04:40)
Roger Codger - S1-E6
Continuity mistake: Steve, Hayley and Francine all stand next to the door when Bullock arrives. They are all standing right next to the door in the shot where Stan adjusts their clothes. But they suddenly move a couple feet away from the door in the following shot where Stan opens the door. (00:03:45)
Continuity mistake: After Steve accidentally jabs the wood burner into Stan's penis, he screams and a avalanche occurs. Then when Stan screams a second time due to putting the cream on his penis, the avalanche happens again but the same amount of snow is on the mountain even after a load already fell off it. (00:06:40 - 00:07:30)
Chosen answer: It is just the decision of the creators to do so.
MasterOfAll