Special effects are much cheaper than making something moderately difficult - let alone *really* difficult ... From VW's People Car Project and presented in Beijing (China is now VW's most important market). It is in Chinese, but watch it anyway - the story telling is visual.
But there are some interesting points here for students of physics and engineering. How would you do the levitation? How efficient would it be? Are there any bad effects on living things and how big are they? How efficient is this and how does it compare to conventional transportation technologies?