When Gulliver's torn shirt is first shown and onward, his sleeves are torn just past the shoulder on both sides. Then King Bombo attacks. Gulliver sits up, Bombo leaves and Gulliver looks around, and his left sleeve has a hole tore at the shoulder seam, but once it cuts away to the townsfolk, then finally back to Gulliver, his left sleeve is back to how it was before.
On the night of 5 November 1699, when Gulliver arrives in Lilliput, the Moon is full. In reality, the Moon was in the waxing gibbous phase on that date.
When Gulliver is at the sea side after he tucks King Little and the others in at the table, a lighthouse can be seen to his left. He sits up and puts the lighthouse on his right. All the time Gulliver is seen from the front the lighthouse is there, but when it's moved to a shot from behind him at the end of the scene, the lighthouse disappears completely.