In the "Ocean's 11" filming scene, "Sinatra" can be seen wearing a two-button gray jacket. In reality, the original jacket was a three-button and was given by Frank to his son Frank, Jr., after the filming.
Frank asks Peter how tall he is and Peter answers, "6 foot 2". Peter Lawford was 6' even.
The house where Peter Lawford talks with Robert F. Kennedy over the phone, is not a true likeness to the real home Lawford owned in Calfornia. The home Lawford had was a massive estate on the beach in Santa Monica purchased from Louis B. Mayer and was not a futuristic round house as depicted in this film.
In the scene where Sinatra goes crazy upon learning that JFK will not be staying at his house, he begins pounding on a plaque which says "John F. Kennedy slept here November 6th and 7th 1960" JFK did not become president until January of 1961 yet we've already seen him in the White House and being referred to as Mr. President. Sinatra was even talking about building bungalows for the Secret Service which would not have been protecting him at that time. In reality JFK's visit to Sinatra's house was set for 1963 not 1960.
On election night, Frank Sinatra is talking on a phone. The receiver is clearly connected to the phone wire with an RJ-11 jack. That kind of connection is common now but did not exist in 1960.
The Sands hotel tower is seen, yet this was not built until 1966-67, and this film is set in 1960. The Sands Hotel sign which is shown a few times in the film is a mock-up with the new modern Sands logotype that was used before its closure, not the famous script design which actually stood on the Sands property during the 1960s.