Continuity mistake: After the mouse is revived by water from Jasper, he goes up to the cat and you can see that the mouse's left hand is under Jasper's mouth, but in the next shot his hand is now near the whisker area.
Continuity mistake: When Papa Bear is drinking from the hot water tap after eating the hot porridge, the tap handle changes position between shots.
Other mistake: It's the Professor's 60th birthday and the candles on his cake must be the trick type - they keep going out as the cake is carried into the room, but they quickly come back on again. But when it comes time for the Professor to blow them out, there's no problem - he blows them out easily.
Continuity mistake: When Porky is searching for his contract in the waste-paper basket in Leon Schlesinger's office, he leaves some paper on the floor. But when Leon tells him to go back to work, we cut to Porky and the paper has gone.
Continuity mistake: At the beginning of the cartoon, you can see the front of Donald Duck's kayak has nothing on it. But after he is soaked by a waterfall, a lever appears out of nowhere. The lever disappears in the next shot, but when he arrives at the campsite, it is back again.
Continuity mistake: After Mickey hides Pluto in his suitcase in Burbank, Mickey picks up his cane and runs to the train, then when Mickey actually jumps onto the train caboose he's only carrying his suitcase, he does not have his cane, nor does he have Pluto's suitcase (which had been filled with bones) with him. The cane reappears on the train later, and at the end Pluto's suitcase mysteriously reappears when Pete throws it at the duo in Pomona.
Continuity mistake: When Ellen tells her mother-in-law about her whereabouts in the Indian Ocean, Irene Dunn's hand is held high up on the column, and at the base in the following shot. (00:09:35)
Continuity mistake: Stan puts the half-folded newspaper down on the boat's galley table. One shot later, the paper is completely unfolded and covering the table. (00:46:05)
Continuity mistake: In the climactic sword fight between Power and Rathbone, the Captain hand Diego a sword and they immediately start a classic duel. At end, Diego pulls off a dueling glove that he had never put on.