Plot hole: Glass or paste stones would have melted during Franks' cremation. But we're supposed to believe they ended up in the urn. (00:33:38)
Plot hole: When Saxby tells Blofeld to watch Peter Franks on the CCTV, Blofeld would have recognised him as James Bond. Why does Blofeld keep quiet about it? What possible use could he have for catching, rather than killing, Bond? (00:38:34)
Plot hole: Other than giving Bond and Whyte the idea that Blofeld must be hiding out on the oil rig platform, there's no reason as far as Blofeld is concerned to have the oil rig on the map in the penthouse. Nobody other than Blofeld or Whyte knew about the map until Bond enter the penthouse, so it made no sense for Blofeld to have Baja, CA on the map.
Plot hole: When Bond arrives at the oil rig he is in a silver sphere with no windows, but he somehow knows which direction to go in. Not only that, the parachutes completely disappear.
Chosen answer: Blofeld and Spectre has enough diamonds for the laser he is building to hold the Earth hostage. In typical Spectre fashion, since he is finished with the operation, he wants to leave no loose ends that could tie Spectre into the mix.
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