Minato being naruto's dad. (Only ppl with yellow spikey hair)
Tobi being obito( his hairstyle and his kamui looking just like kakashi's)
Minato having the other half of kurama(both chakra and soul)
TBH Kishimoto isn't that skillful a writer. PPl on the base look way to far into things and chances are he ends up picking the most obvious choice.
Only thing that came as a surprise is rins death but even then it doesn't make sense since yagura was the 3 tailed jin at the time and wasn't being manipulated by anyone(madara being stuck in a cave)