There is a lesson in here specific to Captains as well as the myriad of lessons for all crew.
The Captain thought that flap 40 was the wise choice, enough so that he said
18:48:26.8 HOT-1 (you have to go) flaps forty don't ch'ya?
The f/o, ( with 220 hours on type) replies " nah, auto-brake three will do it" to which the Captain replies
18:48:34.0 HOT-1 alright.
Obviously not calling the go-around at the end of the touch down zone was a major mistake but that lack of assertiveness/command whatever you want to call it was evident during the briefing when the f/o didn't take the hint and the Captain failed to ensure the ship was configured how he thought was appropriate.