No Continuity Whatsoever!
I used to watch this movie as a kid all the time, but when I recently saw this again because it's been a while, I noticed the film had a huge mistake in it's story. In the beginning of the movie, the Coneheads are being hunted by the INS and are expecting a baby, then soon the INS gives up the hunt. Then the story jumps ahead 18 years when their daughter is in high school, and then INS agents Michael McKean and David Spade begin to hunt the Coneheads again, except there's one problem, McKean's and Spade's characters have not aged at all in the course of 18 years! How is it possible that every character could grow older in 18 years except for these two? It is unbelievable how such an asinine mistake could happen. If you don't believe me, watch the whole movie and you won't miss it.
-"Street is Reet!"