This movie is pretty much criminally underrated. I don't care how high you rate it, you probably don't rate it highly enough. Boudreau's comin' for ya!
This is Aykroyd's best character. I love him in this. I can watch it over and over and over. Of course, having the dark and dreamy John Cusack in it doesn't hurt.
Melanie the waitress was played by Wendy Thorlakson. In 2005 she co-produced a poorly-received Amanda Bynes vehicle called Lovewrecked. The other producers were three other little-known actors and Lance Bass from 'N Sync.
I don't know if this really answers your question.