Hidden behind this controversy is one reason for all those chains and ropes, which has to do with the history of the fight for women’s rights. Because Marston kept his true relationship with Olive Byrne a secret, he kept his family’s ties to Margaret Sanger a secret, too. Marston, Byrne and Holloway, and even Harry G. Peter, the artist who drew Wonder Woman, had all been powerfully influenced by the suffrage, feminism and birth control movements. And each of those movements had used chains as a centerpiece of its iconography.
The Invisible Plane was a creation of Diana's during her younger years on Paradise Island. She created it to be an improvement on her mother's planes which would be shot down in Man's World. The result of her innovation was an invisible plane that could fly at terrific speeds silently and not be detected by hostile forces. Initially, it was portrayed as being transparent.
Steve Trevor died at the end of Wonder Woman after sacrificing himself to ensure that a plane full of deadly gas couldn’t harm anyone on the ground. Is this Steve Trevor the same Steve Trevor that we saw in Wonder Woman who was transported to 1984 because of something like time travel, a descendant of Steve Trevor’s who is also named Steve Trevor (and looks exactly like Pine), a clone, or something else entirely? (It’s a comic book movie, so anything is possible.)