Continuity mistake: After the shark bites off the rest of the paddle, leaving the handle, Gilligan hesitates a second, sees no paddle, and begins swatting at the shark. A moment later, in the closeup, he's paddling, hears the bite again, and pulls the handle up, showing the paddle is gone.
Topsy-Turvy - S3-E10
Continuity mistake: As the Professor cautions Gilligan about hallucinations, the long table is visible through the door. When the camera is close to the Professor and Skipper, the table is gone.
Topsy-Turvy - S3-E10
Continuity mistake: When Gilligan looks at the papaya tree, the fruit is yellow. When he gets to the tree, the fruit is green.
Continuity mistake: When Balinkoff shows Gilligan the control computer, it is off, but Gilligan is under control. A moment later, it is on.
Continuity mistake: Between the time the Professor is put into the trance and waking up, his mouth mouth goes from agape, and head turned to the left, to mouth closed, facing forward.
Pass the Vegetables, Please - S3-E3
Continuity mistake: The compound of huts seems to be very close to the beach, as the Professor, Skipper and Gilligan look out and can see it. Other times, it's a fair distance away through the jungle and obscured.
Pass the Vegetables, Please - S3-E3
Continuity mistake: As the camera is close up on the radio, Mary Ann's hand is down on the table. In the wide shot, it's suddenly up holding a fork.
Continuity mistake: The bill referred to by Lovey when the Skipper and Thurston are arguing changes from stage money to a real one dollar bill, and back between shots.
Continuity mistake: As the rock that triggers the trap is pulled, the vine used slides completely off it. In the wide shot, the vine is securely around the trigger rock.
Continuity mistake: There are several shots of the island used in the series. In the opening, it appears small. In some inland shots it appears immense and mountainous, despite being described numerous times as a "tiny island somewhere in the Pacific."
Operation: Steam Heat - S2-E25
Continuity mistake: The professor wound the clock on the bomb by turning the hand to nine. A second after it was tossed in, it reads eight. It then takes about about fifteen seconds between the numbers to get to zero.
Continuity mistake: The professor is put under a trance, referred to as "zombiefied." When it first happens, the professor is looking to his left. Later on, he's looking straight ahead.
Continuity mistake: When the imposter Gilligan is playing chess with Mr. Howell, the long shots show the imposter holding the spoon transmitter near the center of the table the chess board is on, whereas the close-ups show the transmitter close to the edge of the table.
Continuity mistake: After the earthquake the skipper is holding the idol with both hands. The shot changes and only one hand is holding the idol.
The Friendly Physician - S2-E29
Continuity mistake: After Skipper admonishes Gilligan for his suggestion, Balinkoff says "No, no", and starts to gesture with his right hand. After the angle change, he starts to gesture again.
Pass the Vegetables, Please - S3-E3
Continuity mistake: When the camera is in wide shot of the table scene where everybody fainted at the Professor's announcement, he has the book at belt level. In the close up, he has it at chest height.
Continuity mistake: In the hut, "Gilligan" has the spoon of his transmitter knife open so his commander can hear the conversation. In the wide angle shots, the spoon is half way out. In the close ups, it's fully in position.
Ship Ahoax - S2-E23
Continuity mistake: The Professor is under the table which has a cloth positioned so he can't be seen. However, in the shots of him, you can see the background, and nobody's feet or the cloth.
Continuity mistake: In the opening credits, the boat used as the Minnow changes. It goes from having an upper steering deck, to flat topped and different colored, and back.
Answer: Bob Denver answered this when he was on a talk show hosted by Pat Sajak. He said they were going to write into an episode where the castaways found all these clothes, but it got too complicated, so he said, they decided, "who cares, it's only a TV show," and forgot about it. So the writers and actors even asked this, they just never bothered to address it.