The Jets rank last in yards and second-to-last in scoring. Maybe the oddsmaker believes their scoring will pick up with Sam Darnold set to go behind center for the first time since opening week after being felled by mononucleosis because this total seems high to me. 
Darnold is a major improvement on Luke Falk, who had no business ever starting an NFL game. But Darnold figures to be rusty and may not be 100 percent. This is just his second year in the NFL. He was inconsistent as a rookie. 
The Cowboys could be without their two starting offensive tackles, six-time Pro Bowl left tackle Tyron Smith and right tackle La'el Collins. 
I forsee a lot of running in this game, which eats up clock. The Jets heavily rely on Le'Veon Bell, who isn't such a superstar behind a sub-par offensive line. Dallas is going to feed Ezekiel Elliott.