The H-4 Hercules, aka, "The Spruce Goose," actually flew its one and only flight on November 2, 1947, well before the events of the film.
The Mabrey,s as Baptists, said a commonly used Catholic grace before a meal. In that period of the 1950's, no Baptist would be caught dead in saying a Catholic anything.
When Frank first drives Marla and her mom, they travel east on Hollywood Boulevard, passing the Egyptian Theatre on their right. A few seconds later, the Chinese Theatre goes past on their left. They should have passed the Chinese Theatre first.
The takeoff of the Lockheed Constellation was inconsistent with flight characteristics of the Connie, or other propliners of the day. The plane took off, rotated, and climbed at a 30 degree angle. This was not an F-14 jet fighter, folks. That airplane's rate of climb was about 1/4 that of a jetliner, whose power to weight ratio was much higher.
Throughout the 1958 scenes, Frank is driving a 1961 Chrysler. Hughes wasn't that rich.
The movie begins with a "1964" dateline and later has a "five years before" card on screen. At one point, a radio broadcast informs listeners that the Brooklyn Dodgers will soon be moving to Los Angeles. By 1959 they had already done so and in fact played the Chicago White Sox in the World Series that year.
Howard Hughes was married to Jean Peters from 1957-1971 so was not single and needing a wife to keep him out of the loony bin as purported in the story line.
This is supposed to be 1958 when Frank drives to Las Vegas, yet the marquee on Wilbur Clark's Desert Inn says "Lou Walters All New 1955 Latin Quarter Review".
Although supposedly set in 1958, Hughes' is shown crashing the XF-11 prototype aircraft, which actually happened over a decade earlier, on July 7, 1946.
The Mabrey,s as Baptists, said a commonly used Catholic grace before a meal. In that period of the 1950's, no Baptist would be caught dead in saying a Catholic ANYTHING.
Although it's 1958, the film shows the "5 Star" street lights lining Hollywood Blvd as Frank drives. The "5 Star" lights didn't go in until 1960 when the Walk of Fame was constructed.
In one scene, Howard and Harlan discuss the fact that Marla is the only RKO contract girl with the initials MM. Later in the film, however, we learned that Mamie's last name also begins with the letter M.
In a conversation with Marla Howard refers to "a couple of limeys" who worked out DNA. Watson and Crick did their work in England, but Watson is American.