Revealing mistake: When Wonder Woman is swimming in the sea, it is obvious that she is in a swimming pool instead.
Continuity mistake: Diana gets into the torpedo holding Como's hand, then lets it go. An instant cut later she is holding it again and letting it go again.
Continuity mistake: Despite the submarine taking a nosedive, the shots inside show that the people and objects remain perpendicular to the floor, unaffected.
Visible crew/equipment: Filming lights are reflected on Diana's car. (00:15:00)
Continuity mistake: Wonder Woman reads the back of the photograph, lying it horizontally on the palm of her hand. A shot later, it's in a vertical position. (00:08:52)
Continuity mistake: A thug drops a photo booth picture that appears wrinkled in a Z shape. When Wonder Woman picks it up, it's straight.
Continuity mistake: The Russian pilot is wearing an army-green coloured helmet. When his seat is ejected, it swaps to gold coloured.
Continuity mistake: The opening scene shows a flying plane, which alternates between an obvious scale model and stock footage of a real plane. They look nothing alike.
Continuity mistake: The UFO from the opening scene keeps changing colour: white, violet, light green, lime green, light blue, and pink, because of the blue screen compositing or whatever crappy FX they used.
Answer: The transformation twirling was invented for the 1970s TV series only, to explain her quick change from Diana Prince to Wonder Woman. However, it would have been nice to do a little spin homage in the movie.