A is for Android. Soong android to be specific. Of which yet another one looking precisely like Data is discovered in this film.
B is for B-4. A wasted premise.
C is for Clone, which Shinzon was
D is for Data's demise
E is for Emergency Transport Unit
F is for Fantastic premise of a Picard clone that isn't explained very well at all.
G is for the green glowing fairy dust that flys through the air when the thaleron weapon is activated.