Revealing mistake: The final scene is filmed in Brant Rock MA, and the weather is blatantly CGI. If you notice almost everyone is bone dry in a supposed driving rain storm. Look especially at the character perched on top of the submarine tower. For contrast note the "pizza delivery" scene where it is raining heavily and everyone involved is soaking wet.
The Equalizer 2 (2018)
1 revealing mistake - chronological order
Directed by: Antoine Fuqua
Starring: Denzel Washington, Bill Pullman, Melissa Leo, Pedro Pascal, Ashton Sanders, Orson Bean
Visible crew/equipment: After burning the car, when Dave takes the trash out there is a camera operator at the end of his driveway. (01:11:00)
Robert McCall: Man ain't spelled g-u-n, son. You got a choice. You got talent. You got a chance, and I don't want to hear 'bout your environment, what your momma didn't give you and the white man won't give you, no shot, you got a chance. Use it while you're still alive. You don't know what death is. You have no idea what death is. Make a decision.
Answer: Extremely high winds from the storm. He was relatively protected lying down but blew backwards when he got up.
A cable on the roof grabbed him and pulled him back due to the wind velocity.