Other mistake: As Ray and Emma are drifting around San Francisco in the speedboat, they come across a Navy ship that just got carried in with the tsunami and is now leaning 20 stories high against a building with water dripping from it. If the tsunami were that high, with the wave having now receded back down to ground level, why are there still fires burning down low? The wave would have snuffed them out. (01:30:40)
Other mistake: The same section of the Golden Gate bridge is shown being stripped from its suspension cables twice: once when the quake hits and once when the container ship hits bottom and tips over. Also the ship cannot hit bottom, as the depth of the channel beneath the bridge is greater than 600'.
Other mistake: At the Hoover Dam scene at the beginning of the film, the dam starts to collapse, when the ground starts to crumble and Kim is running to safety, we see numerous cars on the bridge, most of the cars on the dam have right hand drive wiper blades. This would not be possible since the USA drive on the right hand side. The wipers should be pointing the other way. This is also used for the Golden Gate Bridge scene as well.
Answer: You haven't missed anything. After the successful CPR, Blake is still wearing the two heart necklaces, but a considerable amount of time passes between then and when Ben gives them back to her, so we can presume that the necklaces had fallen off at some point in between. Since Blake had taken it upon herself to wear her sister's necklace with her own, the two chains could have been clasped together (which I've done myself), as if one.
Super Grover ★