Other mistake: Wonder Woman is downtown in DC saving random people. She kicks a red sports car that was probably going to run over a hideously dressed jogger. She kicks it from the right side. The car spins towards the middle of the crossroads, and its hood faces the left turn of the crossroads. For a moment we see Wonder Woman go 'woosh' crossing the road in front of the car that is at a full stop in that position. It does not even begin to make sense, she is not coming from the same part of the road she was at. (00:11:45)
Other mistake: The clocks inside the Oval office and the one you can see behind Carl as he is giving Diana the boring tour point at different times despite the two scenes happening simultaneously. (01:43:45)
Other mistake: Barbara is on the phone with Diana (which per se is already a feat, an international call from a public phone in 1984) and tells her what she discovered. It's broad daylight for both of them and meanwhile the TV announces that Max came into possession of half of the world's oil reserves, which were in Arabia. Let's assume he had someone from his escort party wish him there, but then again, if he could just teleport, he wouldn't take planes and helicopters as he keeps doing throughout the movie. And the news say that a "instability resulted in a nationwide run on gas." Already? It barely just happened now. Timing seems all over the place. (01:27:10)
Other mistake: Steve and Diana get a wonderful view of the fireworks flying through them. They are on a jet plane and Steve is actively flying it with the engines on, but they get the kind of view you'd get driving lazily a car on a country road. (01:11:30)
Answer: There's no definitive answer (and hopefully others will weigh in here with opinions). Diana had wistfully wished that Steve was still alive without ever knowing or intending it would happen, nor did she have control over the form it took. By happenstance, another man's body was possessed. The movie's timeframe is too short to know what ethical decisions would eventually have been made over Steve's soul inhabiting another body, though he does mention the moral dilemma it poses. After a reasonable amount of time, they would have to decide if Steve should continue in a co-opted body. Character-wise, it shows Diana's anguish over losing Steve yet again in order to defeat Cheetah. Steve's soul being brought back may foreshadow his resurrection in another way in the next film. Chris Pine (Steve) is reportedly returning for Wonder Woman 3.
raywest ★