When Tonya Harding competed, song lyrics were not allowed in competition the way they are today. Although she included "Sleeping Bag" by ZZ Top in the 3d section of her 1991-1992 program, it was the music only.
When Tonya is competing in the 1994 Olympics, during the broken lace incident, we see that actress Margot is wearing almost new, pristine skates. Skaters wear the same skates used in their intense practices, where the skates get banged up and scuffed. If they switched to new skates for the competition, they wouldn't be properly broken in. Historic photos showing Tonya's skates during the lace examination, show the wear, partially explaining the broken laces.
In the dressing room at the Olympics the electrical sockets are the rectangular North American 110V type. As the Olympics were in Norway they should have been the round pin 220V European type.
During the scene where Diane Rawlinson approaches Tonya to convince her to try out for the Olympics again at the back of the diner where Tonya works, you can see the electric meter behind Tonya is a "smart meter". These digital meters did not exist at this time of the movie.
The music Tonya actually used in her famous 1994 Olympic final program was from "Jurassic Park". The movie uses similar, but different music.
At the 1991 U.S. Figure Skating Championships, judge number nine, Roger A. Glenn of Appleton, Wisconsin, awarded Tonya a perfect 6.0 for technical merit in the free skate. In the film, a 5.9 is indicated on the board.
The Olympic flag has a white background, with five interlaced rings in the centre: blue, yellow, black, green and red. A different ring orientation is used in the film, likely to avoid trademark infringement.
When Diane Rawlins tries to convince Tonya to try out for the 1994 Winter Olympics, she says, "The Olympic committee announced today the next Olympics are going to be in 2 years instead of 4." The decision to hold the games in 1994 was actually announced in 1986, and Lillehammer was chosen as the host city in 1988.
At sanctioned figure skating events, flash photography is not permitted at any time the competitors are on the ice, including the warm up. It's a distraction and a potential hazard to the skaters.
When Tonya and Jeff are leaving Diane's house you can see few policemen with police cars securing the set in the background.
When the Hard Copy producer (Cannavale) is being interviewed, the clock in the background always reads 8:00.
Between shots, the rink at the 1986 Skate America event in Portland, Maine, changes from having Olympic torch and snowflake graphics on the boards to correctly having sponsor logos.
In the end credits listing Music, the artist who performs 'Devil Woman' is credited as 'Cliff Richards'. The correct spelling is Cliff Richard.
In a scene at the XVI Olympic Winter Games in Albertville, France, Tonya watches a television monitor that shows Nancy Kerrigan being awarded a bronze medal. A commentator says, "Tonya Harding of the United States wound up in fourth place." However, Tonya had just completed her original program, and the medalists and the overall placements weren't determined until after the free skate two days later.
In the music section of the end credits, the title of the song "Barracuda" by Heart is misspelled as "Barrucuda".
The film is set in the 1990s, but some post-2000 cars drive around in the background.
When at the 1986 Portland Skate America, there are Cat 5 Ethernet jacks visible on the wall in the dressing room. Computer connections were over coaxial cables at the time. The modern Cat 5 Ethernet cable would not be invented until 1991.
In a scene depicting the rear of Joe Louis Arena in Detroit, tall pine trees and parking lot are shown. JLA and Cobo Center back up almost directly to the Detroit River. A shot filmed there would show the river and the skyline of Windsor, Canada.
When Shawn and Jeff are having a discussion in The Golden Buddha restaurant, Jeff's hand that he uses to point at Shawn switches from right to left, depending on whose viewpoint we're seeing.
The design on the ice in Lillehammer is a different colour and shape than portrayed in the film. Also the design is never visible in the "on ice" scenes.
The Joe Louis arena in the film has blue seats. Joe Louis was the home of the Detroit Red Wings until 2017 and has always had red seats.
Following the 1992 Olympics, when Tonya is working as a waitress, her coach approaches her to tell her the Olympic Committee has announced the next Games will be in two years, not four. It was known well before the 1992 Olympics that the next Winter Olympic Games would be in 1994, not 1996.
In the pivotal scene at the 1991 U.S. Figure Skating Championships in Minneapolis, Minnesota, Tonya's back crossovers and glide into the historic triple Axel uses recycled footage of the setup for the opening triple Lutz.
The Maxwell House coffee logo shown during a skating competition taking place in 1986 is from the 1990s or later.
Near the end of the film, while Jeff is explaining how the media so quickly moved on from his story to the next new item in the news cycle, the new van parked in front of his home is a newer model Ford E-Series van than what was used at the time. While that body style of E-Series was in production at the time, lights and wheels of the van signify it as being from at least 2001 or later. Also, the equipment mounted on the van is not what would be common for that time.
When Tonya leaves here house and the press is waiting for her she doesn't close her front door thus making the cinematographer able to leave the house as well.
Jeff tells Shawn the "incident" is a "clusterfuck". At the time, this phrase was primarily used in the military (often abbreviated 'CF',' or Charlie Foxtrot), and likely would not have been known to Jeff.. Interesting to note that there are other such language usage incidents and obvious current day continuity errors throughout. They could be deliberate in keeping with the contradictory narration technique used throughout.
In actor Bobby Cannavale's multiple scenes as Martin Maddox, there is a clock on the wall in the background. The hands of the clock remain at 8:00 in each scene.
During scene at the diner, when Tonya talks with LaVona, LaVona smokes a cigarette. She puts the lighter on the packet of her cigarettes. After some time, the lighter is suddenly next to the packet and at the end of the scene, again on the packet.