In New Digs, it goes from day to night in 2 minutes.

In "Krabby Land", Mr. Krabs told SpongeBob the true meaning (his opinion) of summer. And near the end, SpongeBob said to Squidward "I thought I knew the true meaning of summer, but that was a long time ago", but Squidward points out "You mean this morning?" As SpongeBob agrees by saying "Yeah," Even though the episode took place through two days.

In "The Gift of Gum", It is "National Best Friend's Day", and when SpongeBob tries getting rid of Gummy during the night, he gets stuck, along with Sandy and Squidward until the next morning, but near the end Patrick said "It's still best friends' day" even though the episode took place through two days.

In "Gone", SpongeBob pointed out that the entire Bikini Bottom was gone for weeks during "National No SpongeBob Day", but the episode took place through five days.

In Patrick Smartpants, the spot where Sponge pointed out was FAR away from where Patrick's head actually landed.

In 20,000 Patties Under the Sea, Sponge and Pat said that they had to ditch the money so that they could escape the hole, but were able to bring back a bunch of colored rocks. They can't carry a bunch of dollars out of the hole, but they can carry a bunch of rocks out just fine.

In Squid on Strike, during Squid's flashforward, his sign changes from "Krabs Still Unfair" to "Krusty Still Unfair."

SpongeSebastian told me about this, but I notcied it when I watched it last night. In Cultre Shock, when SpongeBob clicks his fingers, the coin at the top goes from brown to silver.

Also, an obvious one, in Pizza Delivery, it's closing time when they leave, and it's daytime when they're done. And they didn't do it overnight.

In Jellyfishing, when Squid's getting chased by the big jellyfish, his net switches hands every time he passes by.

In Jellyfish Jam, when Spongebob is telling Squidward to play better, the living room is on the second floor.

In Jellyfishing, if you look carefully in the background during the bicycle scene, you can see a small rock floating in mid-air.

In SquidBob TentaclePants, when Squidward stretches his head to talk to Sandy, look at his arm. It's his tentacle, not SpongeBob's hand.

The first error the show ever made:

In "Help Wanted" when SpongeBob says "I'm Ready" the last time his collar turns red.

I always thought he looked to tall in HSP, but I didn't know about the other 2.

In Employee of the Month, when Sponge and Squid are making Krabby Patties on the grill, there's a second grill behind them under the little window.

In Ghost Host, when Squid is talking with his mom, his teeth keep changing from yellow to white.

In The Smoking Peanut, when Patrick walks up to Spongebob saying, "Hey Spongebob," his eyebrows are pink (yes, this is with the thicker eyebrows).

In No Nose Knows, Patrick goes into Squid's kitchen (which is on the first floor) to eat his cheese collection. But then when he looks out the window at Sponge's house, he does so through Squid's second-story window. He's still in the kitchen when this happens.

In Krabs a la Mode, after Krabs freezes Plankton, the conflict is immediately resolved. However, Krabs was still on the floor when he turned down the thermostat, so wouldn't he get frozen too, and nobody would win?

The kitchen grill sometimes changes sides in the room. Though it's mostly directly underneath the counter window, sometimes it's on the opposite wall (i.e. Your Shoe's Untied) or on the side wall (i.e. Neptune's Spatula).

In "Penny Foolish", when Mr. Krabs has SpongeBob check all his pockets, he forgets to have him check his right pocket, which was where he was originally seen putting the "penny".

In "Rock-a-Bye Bivalve", in one of the scenes where stressed-out-from-work Patrick is walking past multitasking SpongeBob, SpongeBob's tie is black for the entire shot.

Squidward's yellow tentacle in "Club SpongeBob".

In "Best Day Ever", when Squidward says, "And I suppose if you hadn't fixed my reed, the concert wouldn't been a bust," Sandy's tail is white.

In "Spy Buddies", it was night at the beginning, but when SpongeBob and Patrick come in to the Krusty Krab, it's daytime. It's also nighttime when SpongeBob and Patrick are at the Chum Bucket, but it's daytime when the Chum Bucket explodes.

Shangheided: Patchy's eyepatch changes eyes after the "Please stand by" sign goes off

In "Hall Monitor", Patrick keeps moving from the path to the sand next to it when he's talking to the police officers.