These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Broken Aesop: When Korben is left alone with unconscious Leeloo at Cornelius’ apartment, he kisses her cheek. She wakes up while he does, aims a gun at his face, and angrily tells him ‘[...] never without my permission!’ Later, during the film climax, Korben manages to activate her powers by kissing her, despite the fact she said she has never experienced love, and without her giving him permission.
Heartwarming Moments - The little loving smile that appears on Corben's face when he realizes his mom is on the phone, even though she is already in the middle of a thorough rant complaining about her son. It's just nice to see a son loving his mother, and enjoying talking...er...listening....to her, despite the fact that she keeps criticizing him.
Narm: Leeloo being pushed over the edge into thinking Humans Are Bastards by a shot of a nuclear explosion. It loses a lot of power when you realize: A. She has absolutely no context for what the image means, and B. Seeing as it was filmed in the first place, it's probably just a test.
Special Effects Failure: The "unbreakable" glass container Leeloo breaks out of clearly has a nice circle of breakaway glass, visible for at least a second before she actually punches it.
The black stuff running down Zorg's head is creepy and all, but it really looks like chocolate syrup, especially when smeared.
The wall Leeloo jumps through after the bit with the glass above is clearly tin foil painted bronze.
Diva is clearly someone just wearing a bodysuit.
What an Idiot: No one thinks to tell the police that they are chasing an incredibly valuable lab subject that needs to be preserved. As a consequence she is nearly killed when a trigger-happy cop duo decides to shoot Corben's car down on the mere suspicion of being a car thief.