Other mistake: When the whole crew travels to New York in that truck full of fish, when they arrive at the base, before opening the garage, there is a surveillance camera right in front of them above the door. God's Eye could easily spot them through that camera. (00:56:44)
Other mistake: When Dom and Cipher break into Mr Nobody's base, they use "the latest in concussion grenade technology which scrambles all senses and lasts an hour" which would include vision and is reflected as such. 2 min later Letty and Hobbs are able to see the kiss Cipher gives Dom.
Other mistake: When the team get off the sub they leave the hatch open. That can only be closed manually, so the sub would have simply sunk within a few minutes of submerging.
Answer: She showed him Elena's picture to get him to cooperate. He knew Cipher had Elena, but not where, and he didn't know about the baby.
rswarrior