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: 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: 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.
Answer: If you mean by hiding - why is he never seen normally - then it's because he is a recluse and doesn't like to be seen in public (like Howard Hughes was). If you mean by hiding - why was he not seen during the movie - then it's because he was being held captive by Blofeld and his minions. Spectre didn't want him out and about ruining their plans.
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