The napkin contract that promises to forgive Colonel Parker's debts changes between scenes. When Col. Parker picks it up off the table, it reads "Elvis Presley remains in residence." When he drops it backstage, it reads "as long as Elvis Presley remains in residence." The words "as long as" weren't there the first time.
When Elvis is filming "If I Can Dream" for Elvis: The Comeback Special (1968), the sponsor is sitting at the back of the control room. He stands once when the camera is in the control room, and again when the control room is shown from the stage view.
In the film, Elvis becomes aware that Tom Parker is an undocumented immigrant when he can't tour internationally. In reality, Elvis fully believed throughout his life that Parker was originally from Huntington, West Virginia. Parker's immigration status was revealed in 1981 during a court case, four years after Elvis died. If Elvis did find out that Colonel Parker was an illegal immigrant, to get out of his contract all he would have to do is report Parker to Federal Immigration Authorities. Parker would've been deported back to the Netherlands and Elvis would've been out of his contract with Parker since he was an illegal immigrant and not the real Tom Parker who does not exist. His contracts would have been declared null and void and free from him since his contract with Parker was technically illegal. Hence the reason Parker kept his immigration status a secret from Elvis.
Elvis tells Parker that he is fired as his manager after a concert in 1973. In real life, Elvis didn't like confrontation. On several occasions in the 1970s, Elvis would tell one of his crew to tell Parker that he was fired. Parker would respond by telling the staff member that Elvis would have to say that himself to his face, and Elvis never did.
In the film, Tom Parker becomes worried that Elvis is generating controversy. In reality, Parker was delighted that Elvis was causing riots and grabbing headlines for being overly suggestive. It's part of why he wanted Elvis in the first place.
In the film, Elvis and B.B. King are close friends and go to clubs and see Little Richard together. In reality, Elvis and B.B. were acquaintances, but not close friends.
The film suggests that Elvis Presley was introduced to amphetamines by his fellow musicians while they were on the road. In real life, he was introduced to them by his fellow soldiers while in the Army.
Elvis says he has never left the country outside of his Army posting in Germany, and he wants to tour Europe and Japan. In 1957, Elvis Presley played 3 shows in Ottawa, Canada. One show was recorded and released as an LP titled "Elvis in Canada". At the time, traveling to Canada as a US citizen wasn't that different from traveling between states.
Many factual errors and discontinuities may be deliberate, to reinforce the notion that "Colonel" Tom Parker is an unreliable narrator.
Elvis is performing a Christmas special when he and the others learn about the assassination of Robert F. Kennedy. Elvis: The Comeback Special (1968) aired on December 3, 1968, but it was filmed in June 1968, when Kennedy was assassinated.
"Colonel" Tom Parker has a Dutch accent in some scenes. In reality, he spoke with an American Southern accent. It may have been done to emphasize his Dutch origins.
An early scene, set in 1997, shows The International Hotel and Casino. It opened in 1969, and became the Las Vegas Hilton in 1972. The film never mentions its new name, but this is likely the movie-makers avoiding trademark infringement.
When the four of them are traveling in the car, the gearshift is in "Park".
When Elvis performs "That's All Right Momma" at the International Hotel, his acoustic guitar is not plugged in.
The first concert scene at the International Hotel, in 1969, alludes to Elvis' first concert in Las Vegas, but the costume is from 1970. Elvis Presley wore karate Gi's in his 1969 shows.
Elvis' first 45 rpm single "That's All Right" is in a white 'Sunray' printed paper sleeve. In 1954, Sun singles were issued in a plain brown paper sleeve. The 'Sunray' sleeve was introduced in 1959.
When Elvis goes to Club Handy and the streets are filled with vehicles of the era, a 1958 Chevy is parked by the curb.
In an early scene, set in the late 1940s, a Pentecostal pastor wears a clerical shirt with a short white insert in the collar. That type of shirt first appeared in the mid-1960s.
When Elvis & Col. Parker embrace after Elvis' mother's death, Elvis says some words which are heard but his lips do not move.
The opening scene shows flat, desert-like landscape surrounding Tupelo, Mississippi. In real life, Tupelo is surrounded by forests.
When Elvis talks with Priscilla in the limo, the cars have Tennessee license plates, but the LAX terminal is in the background.
When the press questions Colonel Parker's background, one journalist's accent keeps changing from American to Australian and back.