Library Music?
Several people have criticized the score which seems as bizarrely inconsistant as much of the rest of the film. It sounds to me though as if much of it is library music i.e. written for other films or generic compositions. Some of the cues in particular sound like they were written for cartoons or the broadest slapstick comedy.
The ego maniacal and "perfectionist" Hughes may have rejected some or all of a perfectly decent score and instead inserted his own selections from the archives, including many which are absurdly inappropriate.
This seems plausible as the composer is uncredited (and proved elsewhere that he was more than capable).