In the course of a few days on the job as an investigative reporter for a Los Angeles daily, Irwin Fletcher (Chevy Chase) presents himself to various sources as G. Gordon Liddy, Harry S. Truman, Igor Stravinsky, Don Corleone and Arnold Babar (as in the elephant). He also makes up a few monikers: Mr. Poon from the SEC, for example, and John Coctosea ("it's Scotch-Rumanian"). Sometimes he does not bother with name-dropping; he just gets a false beard or teeth from the novelty store and skips blithely into and out of trouble.
Since Fletch writes his column under yet another pseudonym...