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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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 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.
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.
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.