The Feminum Mystique: Part 1 - S1-E5
Continuity mistake: When Drusilla changes into Wonder Girl for the first time, if you look at the ground while she's changing, you can see the leaves instantly change positions all around her.
The Feminum Mystique: Part 1 - S1-E5
Continuity mistake: When Diana comes home and spins into Wonder Woman there's a plant on the table under the mirror, but when she walks out of the kitchen with Drusilla that plant is on the floor. Then, note the only thing atop the hutch is a crystal basket, but when she changes back to Diana Prince two more large items are atop the hutch, now the plant is back on the table, and a tall lamp has suddenly appeared beside the chair.
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.