10 Things Valerian And The City Of A Thousand Planets Gets Hopelessly Wrong

Valerian's ship has a mind-scanning device that can read his thoughts, analyse his brainwaves and recreate images from his dreams. The device would presumably be useful to scan the government officers to make sure they're not up to anything evil, and hence could have avoided the entire plot of the movie by identifying the dastardly commander's predilections towards villainy. Instead it shows up briefly, once, and is never mentioned again.

The plot later makes use of a magic jellyfish living in Alpha's oceans which can read minds (there's a lot of under-utilised mind reading going on) and locate the object of a person's thoughts. Again, a supremely useful, even history-altering ability that no one knows or thinks about until the plot requires it.

There's even a weapon that takes control of another creature's body and allows it to be piloted by a remote control operator. That might have been pretty useful for using proxy bodies controlled by soldiers, instead of sending the soldiers themselves into harm's way.

But that would violate the unwritten rule of Valerian's galaxy, which is that the best technology is only allowed to be shown once.