Trivia: A few of the jokes featured in the movie (the scene when Frank, after falling through Habsburg's warehouse roof, first looks messy and, after smoothing his hair, is totally clean again; or the roof-top shootery with a goon less than two yards away, and always missing) were featured in the Naked Gun's prequel series, Police Squad. Frank's habit of treating every piece of cloth thrown into his face like a monster clinging on likewise originates from that series.
Trivia: In the jazz club, when the sad song is sung, the pictures seen on the wall are historically infamous disasters. The last picture seen is of Michael Dukakis. Later in the scene the disaster pictures change, but this seems to be a gag and does not qualify as a mistake, and we see a picture of a Ford Edsel as another example of a disaster.