K: All right, kid. Here's the deal. At any given time, there are around 1500 aliens on the planet. Most of them right here, in Manhattan. And, most of them are decent enough, just trying to make a living.
J: Cab drivers.
K: No, not as many as you think.
When Will Smith is looking at the two space ships at the MIB headquarters, if you look in the background Zed and K are there typing on the computer. But if you look closer you can tell that they're not even touching the keyboard and the sounds are just added into the movie.
In many European countries, as in Spain and France, since Dennis Rodman's weirdness isn't that well known, the celebrity mentioned in the last line of the movie as being an alien was changed to Michael Jackson.