Mr. Eugene H. Krabs
SpongeBob SquarePants/Gary/Mr. SquarePants/Narrator/Various Others
Dr. Gill Gilliam
When SpongeBob is being chased by the "zombies," there is a fish wearing scuba gear, but later in the chasing scenes, the scuba fish is missing while the other fish from the scene are still there.
When SpongeBob puts Gary on the ground after biting Squidward, the blue cloth from Squidward's pants suddenly disappears from Gary's mouth while the rip in Squidward's pants is still there.
When the news is detailing Mad Snail Disease, the drawing of how it spreads is of Squidward, who was the first one to be bitten.
How is there fire during the disease attack if they are underwater?
How did Gary go up Squidward's large sticks if barbwire covered it? There is no way he could pass the barbwire.
When Perch Perkins said the Mad Snail Disease was spreading through the air, how could the disease spread thorugh the air, if they are underwater?
Look Closely: When SpongeBob pulled up a wallet full of pictures of Patrick, you can see Patrick's butt under his and SpongeBob's picture.
In other episodes, the doctors are purple, but in this episode he's orange.
When Gary was shown hoping on top of Squidward's sharp posts, the reason why Gary remained unharmed is because snail mucous (the slime snails drag underneath) protects the body. It can even protect them while sliding down a sharp sword!
In The SpongeBob SquarePants Movie, Perch Perkins is purple, but in this episode he's orange.
When the doctor pulled the sliver out of Gary it was small. But when it showed him holding it, it was much bigger.
Dr. Gill Gilliam: (after removing the sliver from Gary) I'm sure this was the cause of his distemper, making for serious, grouchy snailitis.
Mr. Krabs: Alright, but it's coming out of your paycheck.
Fish: I don't work here.
Patrick: This disease will ravage your body with bloodshot eyes, loss of balance, messy pants, ticklish rib cage, severely untrimmed toenails, and finally, the bite from that infected snail will turn you into... a zombie. (Squidward screams)
Patrick: You need to get that snail of yours to a doctor before he bites someone important.
(both notice Gary is gone and gasp)
Patrick: There's a mad snail on the loose!
(SpongeBob is being chased by zombies)
Mr. Krabs: SpongeBob! Come in, and let your friends in, too, they look hungry.
Squidward: THAT'S IT! SPONGEBOB!
SpongeBob: Hi, Squidward.
Squidward: Hey, SpongeBob..... KEEP YOUR SHELL VERMIT OFF OF MY PROPERTY!
Patrick: Okay, but I have my eyes on you!
Old Man: (to Patrick) If you can take out your eye and put it on him, wouldn't that make you a zombie, too?
Patrick: Aaahh! I'm a zombie?!
Old Man: How do we know we're all not zombies?
SpongeBob: Squidward, you're not a zombie, remember?
Squidward: Oh, yes I am. (to customer) Welcome to the Krusty Krab, may I take your order?
(SpongeBob runs to Krusty Krab)
SpongeBob: The doors locked! Somebody let me in!
(starts banging on door)
Mr. Krabs: SpongeBob! Hello!
SpongeBob: Mr. Krabs, please let me in!
Customer: Don't let him in! He could be a zombie!
Mr. Krabs: (to SpongeBob) Well, how do we know that you're not zombies like them?
(points toward people behind SpongeBob)
SpongeBob: Mr. Krabs! If I were a zombie, could I do this?
(SpongeBob squeezes through door)
Mr. Krabs: Hey, it's SpongeBob!
SpongeBob: That's right! Now let me in!
Mr. Krabs: Yeah, that's SpongeBob all right!
Patrick: Hmm... I think he might be a zombie. He's looking a little yellow.
SpongeBob: Patrick! Would a zombie have a picture of his best friend in his wallet?
(SpongeBob shows his picture of Patrick and himself)
Patrick: I guess not. But I'll still keep my eye on you.
Plankton doesn't make an appearance in this episode.
Squidward has a pet rock collection.
It's revealed that Squidward is ticklish.
This episode has a similar event with another episode. In this one, Squidward was turned into a zombie by Gary. In "I Was a Teenage Gary," Squidward was apparently turned into a snail.
Squidward is seen slipping on Gary's snail slime when he walks out the door and yells at him. This is the exact same thing Squidgard did in episode "SpongeBob B.C."
The doctor fish that made his first appearance in Season 1 makes a return in this episode, but he's orange instead of purple.
It is revealed that Bikini Bottom citizens are called "Bikini Bottomites."
Sandy does not appear in this episode.
This episode premiered along with a rerun of "The Fry Cook Games."
Once Bitten, Twice Shy
The title of this episode may be an allusion to the saying, "One Bitten, Twice Shy."
The ending is similar to an Ed, Edd n' Eddy episode where Johnny 2x4 pulls a rock out of Ed's shoe, curing Ed of his bad and destructive mood during the episode.
Mad Snail Disease
Mad Snail Disease is a spoof of Mad Cow Disease, which was when the meat of some cows was infected, and transferred the disease to those that ate it.
Episode Title: Once Bitten
It is the same title as a movie called Once Bitten.
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