Continuity mistake: In the scene where Mindy is showing Spongebob and Patrick "Planktopolis," it shows a large fully-built statue of Plankton. A few seconds later the right side of the head is shown missing and still being worked on.
Continuity mistake: Spongebob puts his shirt/shorts clothing on after his dream, and he is wearing underwear. Then, in front of the mirror, when the back of the shorts falls down, it shows his rear end with no underwear. (00:05:15)
Continuity mistake: The glasses and wig on the "ice-cream lady" in the big red monsters mouth fall off in one shot, but they're back on a few shots later. (00:40:15)
Continuity mistake: The seaweed that SpongeBob and Patrick think is facial hair changes length throughout the "Now That We're Men" musical number.
Continuity mistake: When Mr. Krabs is set on fire he runs past once with his clothes, then he runs past in his underwear, then he runs past naked, and jumps into a barrel of water. His clothes are back on. (00:30:05)
Continuity mistake: The "Galley Grub" sign in Krusty Krab 2 moves from above the door with a porthole in it, to next to the door with the anchor painted on it, and then totally disappears later. (00:21:00)
Continuity mistake: Spongebob steps on Plankton, then wipes his shoe, leaving a big green smear on the road. In the following shot it's gone. (00:09:25)
Other mistake: At the beginning, the pirates find about five tickets in the treasure chest - nowhere near enough to admit all the pirates into the theater.
Continuity mistake: When Spongebob and Patrick approach the county line, they meet the two laughing fish; one is short and fat, one tall, thin and has two patches on his knees. These patches disappear in one shot; when the short fat one is bouncing on the other one's stomach and they're both laughing.
Continuity mistake: In many shots, the wooden stairs leading down the trench are not there. (00:42:00)
Continuity mistake: After Spongebob and Patrick receive their "seaweed mustaches" they jump off the edge of the trench. When they figure out that they just jumped off the edge they look down, and directly below, the trench wall is visible with nothing on it. Yet, when they are about to hit the ground there is a branch. (00:48:15)
Continuity mistake: In the Goofy Goober Nut Bar, the pictures hanging on the wall behind Spongebob change in every shot. (00:15:55)
Continuity mistake: In the courtroom scene with King Neptune, Mindy's gold band keeps disappearing and reappearing. (00:13:20 - 00:14:55)
Continuity mistake: When the Goofy Goober Peanut starts singing to the kids, he has a lollypop in his hand, but when the pointing hand comes out of his stomach it is gone, and in the next shot it's back.
Continuity mistake: When Spongebob runs through the skulls to get to the Free Ice Cream Booth, a skull and bones fly out and land in front of the Patty Wagon. Two shots later though, they're gone.
Continuity mistake: When SpongeBob is in King Neptune's hands, you can see there are many people in the Krusty Krab. But when Neptune throws SpongeBob on the ground, nearly everyone vanishes. (00:23:30)
Continuity mistake: In SpongeBob's dream, the Krabby Patty moves all around the table several times. First it's in the center, then near the edge, and then near SpongeBob. (00:03:40)
Continuity mistake: There are bottles next to the chairs at the gas station, but they vanish when the taller guy says, "You two dipsticks ain't gonna last ten seconds over the county line!"
Continuity mistake: When Spongebob and Patrick go to the bar on the way to Shell City, there is a hole in one of the wooden saloon doors which switches to being in the other saloon door when they sneak out. (00:34:20 - 00:36:00)
Continuity mistake: In the live-action pirate beginning, between a wideshot and closeup, the sky changes from grey/overcast to bright blue with fluffy white clouds. (00:01:15)
Chosen answer: The buckets don't brainwash through skin contact. They brainwash through Plankton's signal. All you need to do is wear it close to your brain.
MikeH