Continuity mistake: When the Simpsons are trying to escape the angry mob, as Marge and Homer get into the car, the driver's side mirror is missing from the door. Then in the next shot, the side mirror appears on the door, but now the rear-view mirror has vanished.(00:33:40)
Continuity mistake: We see the interior of Homer's car twice, first when Homer is at the Hazardous Waste Treatment Center, and then again when he and Marge are trying to escape the angry mob. The dashboard and steering column are entirely different both times.(00:23:20 - 00:35:20)
Continuity mistake: When Lisa sees Milhouse near the end, the door on his house hangs askew from the right door jamb and there is nothing above it. However, after Colin shows up, in the next shot when Lisa jumps up, the door now hangs askew from the left door jamb and there is wiring hanging above it (from the broken light fixture). Also note that the roof is much lower, and a spigot appears under the window. Additionally, Lisa's position when talking to Colin changes - first they're standing to the left of the house, then to the right of it, then in front of the stairs at the center.
Continuity mistake: When Homer is driving toward the small Alaskan booth, right beside the booth there is a tall flagpole with two raised flags, but when they leave the flagpole has vanished, though it should be seen in this shot since it's on the same little 'island' as the booth. Also note that the snow on the booth and island has vanished.
Continuity mistake: With the second set of options spread across the desk, when Cargill starts manipulating the President's option choice, there is a blank wall to the President's left (the wall faces the viewers). Also note that in this shot the table behind the President (with framed photos) is gone. When Cargill walks away from the President holding 'option 4', that blank wall now has a built-in bookcase, a table and chair.
Continuity mistake: When Marge sits on the back porch swing knitting 'dome sweet dome' and sees Maggie outside the dome, she runs inside to get Homer. The back door is right behind her and it's a solid door, with the round window missing, though the window does reappear.(00:30:35)
Continuity mistake: After the dome is placed, when the Simpson family runs out the back door of the house and Homer shouts, there is only one window on the second floor, above the back door. There should be two windows. The light fixture on the wall beside the door is also gone in some shots.(00:27:40)
Continuity mistake: After Bart has caused the avalanche in Alaska, the animals help Marge and Homer have a special moment, and when the couple join hands note the large window beside the TV, which just vanishes in the following shots of that bedroom.
Continuity mistake: When Lisa is going door-to-door with the petition, Milhouse opens his front door and there is no mail slot on the door, but when Nelson punches Milhouse in the stomach there's a mail slot on the door, beside the door knob.(00:09:10)
Continuity mistake: When Bart falls off the roof and grabs hold of the gutter, in the overhead shot the gutter is an L-shape with a 90° angle, but after Homer and Bart high-five each other, the gutter is a straight line that ends at the corner.(00:08:10)
Visible crew/equipment: When Engine 68 pulls into the site with the suicide who has changed his mind, there is an actor's T-mark on the ground behind DeSoto, as he puts on his jacket.
Visible crew/equipment: After Gage learns of the death of his last rescue, when he leaves the ER treatment room and passes the wife and daughter, the actor's black tape mark is visible on the floor, at the wife's feet.
Visible crew/equipment: When Dr. Bracket and Dixie begin to explain to Jenny that she was only hyperventilating, as she sits down in the wheelchair, the actor's tape mark is visible on the floor by the door, just before Dr. Bracket walks over and stands on it.
Continuity mistake: In Neverland, when Rumplestiltskin's father tells him to think of a food, a slice of cake appears in the palm of the boy's hand. When Rumple walks to place the cake down, suddenly there's a round, white doily under the slice, but when he sets the cake on the wood the doily is gone again.(00:16:50)
Visible crew/equipment: When DeSoto calls Gage to where he found the dog, the two actors' tape marks are visible on the floor when Gage sits on his bed.
Visible crew/equipment: Station 51 responds to a building collapse with the trapped boy, and when they enter the building with Tommy's friend, the actor's white T-mark is visible on the floor.
Visible crew/equipment: When Dr. Bracket leaves the treatment room with Jenny, who's being wheeled in the wheelchair, he tells her to see her family doctor just as Dixie exits the door, and the shadow of the moving boom mic is visible on the wall, at the top to the left.
Continuity mistake: When Clara and the Doctor watch the lights going out, they first stand in front of the chair, but when the Doctor notes that some planes have WiFi, they stand behind the chair. That chair switches from in front of them to behind them another couple of times.(00:25:03)
Visible crew/equipment: At Rampart, when Gage and DeSoto walk into the staff lounge, where Dixie and Dr. Brackett are seated at the table, there is an actor's T-mark on the floor behind Dixie, where DeSoto stands.
Continuity mistake: Just as Gage and DeSoto walk into Rampart's staff lounge, while discussing practical jokes, DeSoto is holding the handy-talkie in his right hand, but in the next shot the handy-talkie has vanished.