The Original Fry Cook / Night Light - S5-E9
Continuity mistake: Near the end of "Night Light" Patrick gets burned by the sun, and the wooden stem atop his house is missing.
Selling Out/Funny Pants - S4-E5
Continuity mistake: In "Selling Out" when the Krabby O'Mondays is just about to flood, SpongeBob and Squidward have their Krusty Krab hats on. About ten seconds ago, they had their Krabby O' Mondays' hats on.
Nasty Patty / The Idiot Box - S3-E4
Continuity mistake: When SpongeBob is showing Squidward the inside of the box, SpongeBob is seen closing the top of the box. But inside of the box, there is a close-up of SpongeBob and Patrick. You can see daylight so the box is obviously open.
Continuity mistake: When SpongeBob sees the kandy machine, the front of the machine is facing the road, but when he runs over to it, the front is now turned away from the road.
Hello, Bikini Bottom/Extreme Spots - S8-E29
Continuity mistake: In "Hello, Bikini Bottom", when we see Mr. Krabs' list of what he needs for the tour, the word "roadie" is on the bottom of the list, but when we see the list again later on, "roadie" is in the middle of the list.
Gullible Pants/Overbooked - S6-E19
Other mistake: In Overbooked, when Patrick tells Sponge-Bob about his birthday, Sponge-bob put a Krabby patty in his pants. In the next scene when you see Sponge-Bob, the patty is gone.
Continuity mistake: In "New Leaf", When Mr. Krabs throws Plankton's snow globe in to the room, there is no lock. In the next shot, there is.
Summer Job - S7-E18
Continuity mistake: Mrs. Puff hands Spongebob the order for a Krabby Patty. In the next shot, he is not holding the order, nor is it on the floor.
Rise and Shine / Waiting / Sing a Song of Patrick - S5-E1
Continuity mistake: In "Waiting", SpongeBob has milk on his face. It then cuts, and the milk is not on his face anymore.
Squidtastic Voyage/That's No Lady - S4-E15
Continuity mistake: In "That's No Lady", Squidward is standing at the register, holding a newspaper. When it cuts to "Patricia", and back to Squidward, Squidward isn't holding the newspaper anymore.
Skill Crane/Good Neighbors - S4-E4
Continuity mistake: In "Good Neighbors", Squidward stomps on Spongebob and Patrick's fezzes in front of his door. Then, it cuts to a shot of Squidward's house, but the fezzes are gone.
Help Wanted / Reef Blowers / Tea at the Treedome - S1-E2
Continuity mistake: The office door in the Krusty Krab is missing throughout the episode.
Suggested correction: It's a pilot episode. Things can change with a show when it gets picked up into a series.
House Sittin' for Sandy/Smoothe Jazz at Bikini Bottom - S8-E23
Continuity mistake: When Sandy finds SpongeBob and Patrick after wrecking the tree dome, the distance between SpongeBob/Patrick and Sandy changes constantly between shots.
Back to the Past/The Bad Guy Club for Villains - S7-E16
Continuity mistake: The Quickster was a member of the I.J.L.S.A in Mermaid Man and Barnacle Boy V. But in this episode, there isn't The Quickster in the I.J.L.S.A, but instead the Pi-Right Ponderer.
Fear of a Krabby Patty/Shell of a Man - S4-E1
Continuity mistake: When Mr. Krabs drags SpongeBob back into the kitchen, Squidward's facial expression changes between shots.
Karen 2.0/InSPONGEiac - S8-E28
Continuity mistake: Karen dumps a load of chum on a tray and some of the chum lands on the table. The chum that fell on the table magically disappears from shot a split second later.
Continuity mistake: When SpongeBob and Patrick see the map, a compass is seen next to it. As the two start touching the map, the compass has disappeared.
The Krabby Patty That Ate Bikini Bottom/Bubble Buddy Returns - S8-E15
Continuity mistake: The giant Krabby Patty eats SpongeBob's shoe and sock in the kitchen. But by the time SpongeBob and Squidward run to the door and are stopped by Mr. Krabs, the shoe and sock have magically reappeared.
Dying For Pie / Imitation Krabs - S2-E6
Continuity mistake: SpongeBob makes Squidward a tear jumper and there is a shot of Squidward sighing. In this shot, we can see no-one standing around the register. In the next shot, Mr. Krabs has suddenly appeared next to it.
As Seen on TV / Can You Spare a Dime? - S3-E5
Continuity mistake: When SpongeBob is making the patties at the end, he puts at least 20 patties on the grill. But just after he takes the buns out of the bag there are now only 10 patties.