Plot hole: It's assumed that Dr. No had Professor Dent slip the spider into Bond's hotel room that night but if it were that easy to do that then why not just hide an assassin in the room to begin with. Someone had to be in the room to tamper with Bond's briefcase, the closet, and possibly the bottle of liquor so just hide an assassin instead of waiting for the spider to kill Bond. (00:40:00)
Plot hole: When Annie Sullivan, as Helen Keller's teacher, gives Helen a doll that makes a sound, when they are alone in the small house, Helen upends the basket that holds all her dolls, but when the doll makes a sound, Helen grabs the doll and makes the sound the doll makes; but Helen is deaf, so how could she have learnt to imitate it?