Revealing mistake: After Bella gets married and Jacob is angry because he thinks Edward will kill her, Sam tells the pack to leave. When the pack enters the woods, they jump down into what appears to be some sort of pit. You can see blue lights, slightly illuminating the pit area in the woods that Jacob and the pack jump down in. (00:39:00)
Revealing mistake: When Bella calls Rosalie, you can briefly see the cell phone screen before she puts it to her ear. The lock screen is still visible, showing she didn't dial anything. (00:55:45)
Revealing mistake: Notice when Edward picks up Bella at the island. He kind of stumbles like Bella is heavy although he has superhuman strength.
Revealing mistake: When Bella agrees to drink human blood to save herself and her baby, she says: "I'll try anything." If you look closely at her mouth when she speaks, you can see that even prior to her first sip of blood, there is a red substance between her teeth from a previous take.
Answer: Imprinting is an involuntary mechanism. The shape-shifter can't voluntarily imprint on anybody. Jacob tried to imprint on Bella but was unable to do so and began going around looking for other girls to imprint on but, is unable to do it of his own free will.
On the flip side, Sam Ulee was in love with Leah Clearwater, but then he involuntarily imprinted on Emily, dumping Leah and breaking her heart.
raywest ★