Spongebob's design changes halfway through Just One Bite.
In the first half of the episode he's drawn like this: (normal art style 1)
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For the other half of the episode, he's drawn like this (normal art style 2)
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I've also noticed that a lot of season 2/3 episodes have episode pairs with different art styles. However, I don't know what nickname to give these two designs.
It also changes halfway through the strangler:
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You need a razor sharp eye to tell the difference, trust me, there is, these two are not the same designs.
Here's a chart of each art style used in season 3:
41. The Algae's Always Greener (normal art style 1)/ Spongeguard on Duty (markerbob)
42. My Pretty Seahorse (markerbob)/ Club SpongeBob (normal art style 1)
43. Just One Bite (normal art style 1 and 2)/ The Bully (markerbob)
44. Nasty Patty (normal art style 3)/ Idiot Box (normal art style 2)
45. Mermaidman & Barnacleboy IV/ Doing Time (Both use art style 2)
46 Snowball Effect/ One Krabs Trash (double markerbob)
47. As Seen on TV/ Can You Spare a Dime (double markerbob)
48. No Weenies Allowed (normal art style 2)/ Squlliam Returns (markerbob)
49. Rock a Bye Bivalve/ Krab Borg (Both use art syle 2)
50. Chocolate With Nuts (normal art style 2)/ Memraidman & Barnacleboy V (normal art style 1)
51. Party Pooper Pants (art style 2 used in the actual episode, underwater sun segment is markerbob)
52. Chocolate With Nuts (art style 2)/ Mermaidman & Barnacleboy V (art style 1)
53. New Student Starfish (markerbob)/ Clams (normal art style 2)
54. Ugh (art style 1 used in actual episode, but the krusty krab cutaway scene is markerbob)
55. The Great Snail Race (normal art style 1)/ Mid-Life Crustacean (markerbob)
56. Born Again Krabs (normal art style 1)/ I Had an Accident (normal art style 2)
57. Krabby Land/ The Camping episode (double markerbob)
58. Missing Identity (markerbob)/ Plankton's Army (normal art style 2)
59. The Sponge Who Could Fly (art style 3 used in actual episode, the walk cycle is markerbob)
60. SpongeBob Meets the strangler (normal art style 1 & 3)/ Pranks A Lot (markerbob)