Operation: Steam Heat - S2-E25
Continuity mistake: As Thurston tosses a packet of money away, his arm goes full circle, before his hand rests by his mid section. When the camera cuts, his right hand is over the edge at his wrist.
Ship Ahoax - S2-E23
Continuity mistake: When Ginger holds up the Three of Clubs, her fingers are covering the bottom Club on the card. When the shot cuts to her in close up, her fingers are behind the card, with her thumb partially covering the bottom 3.
Don't Bug the Mosquitoes - S2-E12
Continuity mistake: As Gilligan plays the drums, he shakes his head wildly, and the shades fly off. A moment later as they finish their song, Gilligan knocks over a drum, and it's up in the next shot.
Castaways Pictures Presents - S2-E7
Continuity mistake: At the end of the filming, the Professor is drawing a line down the east coast of the United States on the board. When watching the film, the line is missing at the end.
Castaways Pictures Presents - S2-E7
Continuity mistake: After Mary Ann drops the basket, two pieces of fruit pop out of it. When Gilligan goes to pick it up, he picks up several pieces.
Castaways Pictures Presents - S2-E7
Continuity mistake: As Thurston calls cut, in the wide shot Gilligan stops and his spear dips with the tip down. In the closeup, Gilligan is now holding the spear straight up by his side.
Castaways Pictures Presents - S2-E7
Continuity mistake: The amount of rope around Mary Ann varies between shots.
Gilligan Goes Gung-Ho - S3-E15
Continuity mistake: In the final scene when the Skipper has Gilligan in jail, he is holding the law book in front of him. The shot changes and he is now holding it by his side.
Beauty Is as Beauty Does - S2-E2
Continuity mistake: They used a standard electric phonograph. Later on, the phonograph is a bamboo and wood device with a ship's wheel as the turntable. It had to be cranked like the old Victrolas to work.
Continuity mistake: In this episode, the damage to the boat is different than seen in "Two on a Raft." Also, there was a vessel number on the bow of the boat that is absent in this episode.
Continuity mistake: When Skipper tries on the sheet to teach Gilligan not to be scared, we see him putting it on and it is solid white. However, when Gilligan says he isn't scared he says it is because a "ghost doesn't wear a sheet that says S.S. Minnow on it." Now the sheet has wording on it. (00:08:45)
Pass the Vegetables, Please - S3-E3
Continuity mistake: While Mrs. Howell cleans the hut at maximum speed, the book Mr. Howell reads changes position as the scene cuts.
Continuity mistake: As Rodriguez goes back to Ginger, the Skipper straightens his hat. In the closer shot, Skipper straightens his hat again. (00:09:55)
Continuity mistake: As Mr. Howell tells his story, the table Ginger is on rocks to the point the canteen beside her falls off. A second later, she's drinking out of it.
Continuity mistake: After the shark bites Gilligan's paddle and he holds it up, the amount of wood between the handle's connection and the bite differs from shot to shot.
Continuity mistake: At the beginning of the episode when everyone is listening to the radio the professor is shown standing up and in the next shot is sitting down. (00:02:50)
Continuity mistake: While the castaways are standing around while their clothes dry, Mary Ann is not wearing any shoes. As the scene continues she is shown standing wearing black shoes. (00:05:00 - 00:06:00)
Continuity mistake: When the SS Minnow is shown beached on the deserted island, it's seen leaning on its left. At the ending credits, the Minnow is shown completely upright.
The Hunter - S3-E18
Continuity mistake: Gilligan advises Kincaid that there's no game on the island. This contradicts an earlier episode in the same season where the castaways spotted a wild boar roaming the island (episode "Where There's a Will").
Gilligan Meets Jungle Boy - S1-E20
Continuity mistake: When the Skipper squeezes Gilligan to get rid of the helium, in one shot the Skipper's hat is on, and in the other it is not.
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.