On the trip from Skagway to Dawson, James Stewart calls his horse by his real name: Pie.

One of the many films that the actor most people know as Harry Morgan is identified in the opening credits as "Henry Morgan". Born Harry Bratsberg, Morgan went by the name "Henry" (his father's name) almost exclusively in films from 1942 until the mid-1950s, when he transitioned back to Harry to avoid confusion with the humorist Henry Morgan, who was a popular guest on TV talk and game shows during the first two decades of television. Harry Morgan was last credited as "Henry Morgan" in Under Fire (1957), and was often credited as "Henry 'Harry' Morgan" on TV and in movies through the mid-1960s.

Throughout the film, Renee Vallon (Corinne Calvet) is never seen without wearing a hat.

The Athabasca Glacier seen early in the trip to Dawson is actually in Jasper National Park near Calgary and Edmonton, Alberta. Climate change has caused a significant and visible retreat of the glacier since the year of filming. The glacier is retreating at the rate of about 16 feet per year.

Walter Brennan, Jack Elam, Harry Morgan, and Kathleen Freeman all had significant roles in Support Your Local Sheriff! (1969).

Continuity

The distance between Jeff's hand and his six-shooter on the bar changes between shots.

At Jeff's trial in the saloon, the items on the table keep changing positions between shots.



Factual errors

The populace of Dawson City (or any Canadian city) never elected a U.S.-style marshal with tin star to police the city. The Mounted Police were present in the Yukon in large numbers before and during the Klondike gold rush to enforce the law.

There were no gunslingers or shootouts in Dawson City during the Klondike gold rush. The Mounted Police were in the Yukon in large numbers and enforced the law very strictly. Dawson City during the Klondike gold rush was peaceful and not lawless as depicted in the movie.

It was impossible to drive cattle overland from Alaska to Dawson City. There was no route over the mountains that cattle could follow.

The film takes place in 1896. Ronda Castle contracts Jeff Webster to drive her caravan until Dawson, Canada. Nevertheless, that Canadian miner town-site was named Dawson only in January 1897.



Incorrectly regarded as goofs

(at around 19 mins) Gannon slides a gun along a bar counter; after the camera cuts, the gun points the other way. However, as the gun is sliding along the bar counter, it spins 180 degrees causing it to face in the opposite direction.



Revealing mistakes

Nighttime scenes were filmed during daylight hours using a filter to darken the scene. BUT using this technique left the sky blue and the sky at night is ALWAYS black. Further, using this technique always leaves distant objects distinct with detail, where as if it really were night, they would have just disappeared into the background and shadows.

In a climate where there is snow on the ground, the characters are seen wearing costumes worn in warmer temperatures.



Anachronisms

The opening credits are played over a photo of the Athabasca Glacier. An ice road can be seen across the bottom of the screen, leading from the lake at the bottom right and winding off into the distance at the left. As the road turns, an automobile can be seen. The same photo can be seen shortly after crossing the border.

Ronda hides Jeff in her bed on the paddle steamer. When she gets out of bed and stands in front of a mirror, it can be seen that the back of her slip has a zipper in it long before they were invented.

After the clubbing of the sheriff while Jeff is standing in the door of the Dawson Castle, modern brass hinges can be seen on the doors of the saloon. As this was before the city of Dawson was founded in 1896, any hinges on doors would be wrought-iron at best.