The Save the Villain scene seems to simply show us that Vito is good and would help everyone if he has to, even if he hates doing so. But at the same time he also saves earth. As we later see, Mr. Shadow stopped only because Zorg was going to get him the stones, but as soon as that fails, he starts to accelerate to earth again. If Zorg had died earlier, there would not have been enough time to get to Fhloston and get the stones.
Early in the movie, Cornelius explains the prophecy and mentions that if an evil being were to stand in the temple with the four stones, it would cause a class X-2 Apocalypse How. Later, Mr. Shadow appears to be Colony Dropping himself on top of the temple.
At two instances in the film, we get mention of how "old tricks are the best tricks". The Colonel mentions it to Korben Dallas regarding how the military rigged the Gemini Croquet contest so Korben would win. The other is when Zorg is showing off the ZF-1, regarding everything but the Replay feature as "oldies but goldies". This isn't unintentional. The movie is subtly telling us that Leeloo is going to win in the end. She's the oldest trick/weapon that the human race have.
At the beginning of the movie, the Mondoshawans enter the temple, at whom a startled professor asks "Are you German?". This is funny but when you think that the first scene is happening at the dawn of the First World War, the professor could have simply thought the Mondoshawans were German with some kind of armor.
Zorg chews the Mangalores out for not bothering to check that the case they stole actually had what he wanted. He commits the exact same error later, necessitating his return to the ship and prompting his double Karmic Death (see main entry).
When we see the remains of Leeloo's severed hand, it appears to be clutching some kind of handle with elaborate gold decoration. Later on, when the Mangalores deliver the case that's supposed to contain the four stones, it has the same decoration on the handles, and one of them is missing.
Exactly how long has the trash strike been going on? That pile of trash takes up half the concourse, and is like a wall. People walk by and no one comments on the smell (or is wearing some kind of mask to filter out the smell!)
The scene where Korben meets Cornelius at his house with an unconscious Leeloo can be seen as a horrifying take on contemporary New York society: A man shows up at a priest's door dirty and covered in burns and wounds. He is holding a knocked-out barely-dressed girl, who is also dirty and covered in cuts and bruises. Cornelius had no idea who these people were, or even if the girl in question knew the person holding her. All we get is this exchange:
Korben: "I'm lookin' for a priest!"
Cornelius: "Weddings are one floor down, my son. Congratulations."
Especially bad as Cornelius is supposedly in a sect that reveres life, yet can't take 10 seconds out of his busy day to make sure this passed out girl isn't in danger.
This scene is after the Mondoshawan's ship is shot down, and before Cornelius knows that the Fifth Element is still alive. Therefore his disregard may be nothing more than despair that Life will shortly be wiped out.
