Elvis always drank Pepsi-Cola but for product placement, a coke machine was substituted in the film.
Richard M. Nixon:
By the way, Elvis, did you ever, ah, mess around with Marilyn Monroe?
Elvis Presley: No, sir.
Richard M. Nixon: Well, the Kennedys did, you know. Hoover played me the tape.
Elvis Presley: Well, gee, Mr. President, I kinda wish I had a tape of this meetin', so I could play it for muh wife and muh ...
Richard M. Nixon: ...
Approximately 1h15m40s into the film, right after Elvis mentions a $5000 contribution to the DoJ Narcotics department, the shot changes to that of the blue carpet in the room where Nixon is briefed by Bob Haldeman. The seal on the carpet mistakenly reads "PLUAIBUS" in the "E PLURIBUS UNUM".