FAQ

According to the Zucker brothers, Paramount insisted on casting an Oscar winner in a lead role. This lead to George Kennedy being cast as Ed. Kennedy was also lobbying for the role because he didn't get to be in Airplane!.

As for O.J. being cast as Nordberg, it's likely they wanted a popular name and some diversity added to the cast. O.J. was well-liked at the time.

Frank Goes Bump-Bump / Somebody Killed My Scene by Ira Newborn.

It belonged to his henchman that was hired to kill Drebin at the meat factory. Frank throws the thug into a giant vat that had the name of a hotdog brand on it. We see this to be the same hot dog brand handed out at the ball game. As you see the henchman's raised hand sink in to the vat, you can see a ring on his finger. The same ring which Ludwig finds.