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Actually there aren't. What appears to be "white spots" are transparent pixels with the (white) background shining through. One of th big disadvantages of the GIF format is, that it only supports 256 different colors per frame and no alpha transparency. To support transparency anyway, one color slot is simply marked is being transparent.
Since GIF images are usually encoded by using a process called "dithering", which merges similar colors in order meet the 256 maximum color count requirement, there may even be "white spots" in places, where pixels do not match the "transparency color" exactly.
The "white spots" problem ca be worked around in the export settings by simply either choosing a different color slot to be made transparent or by disabling transparency altogether.