Watch the trailer here
From Trailers From Hell. You can play with or without John Landis' commentary. I recommend both:
http://www.trailersfromhell.com/trailers/804
Your link doesn't work anymore.
Here is the updated URL:
https://trailersfromhell.com/lord-love-duck/
Landis commentary: https://youtu.be/gjeijpGMi6M (upscaled, not HD)
Straight trailer: https://www.youtube.com/watch?v=QIxTR-JRO5U
To bad it's only available on DVD.