When Rob and Andy are talking after the first avalanche, the amount of snow on Andy's cap changes between shots from the front and the back.
The path of the storm that Dr. Mackenzie draws in Sharpie on the map changes size and shape between shots.
In the sequence where Rob (Jason Clarke) talks on the phone about de-icing his mask, when the camera cuts back to him, he's not wearing it.
As John Taske approaches Rob to inform him he is turning back, Rob pulls down the hood of his jacket. In the next couple of shots, the hood is back up, then down once more.
When Caroline begins to address the crew, a bearded man, an older gentleman and a young guy are seated to her left (in that order from right to left), but by the end of her speech Helen appears out of nowhere and the bearded guy has disappeared.
When the helicopter picks up Beck, the pilot is not wearing an oxygen mask. As he flew up from Kathmandu, Col. Madan KC was not acclimatized at all and had to be on oxygen continuously to survive at the 20,000 ft altitude at Camp I. Without it he would have passed out in minutes.
Scott Fischer actually spent the night near another climber, Gau Ming Ho, not alone as depicted in the film. Sherpas found both men alive, but believed Fischer beyond saving, and elected to rescue Gau. Gau was also brought down the mountain alongside Beck Weathers, and was the first to be evacuated by helicopter.
At one point when the team are ascending Everest, the time in the corner shows it to be 04:30 AM, yet it is broad daylight. At that time of the year in Nepal, the sun would not even begin to be rising till nearly an hour after this time.
Several times when the climbers and the base camp personnel talk to each other by radio, they end their conversations with "Over and out." This is incorrect. Only one of those words should have been used each time: "Over" means that the speaker is handing the conversation over to the other person for a response. "Out" means the conversation has ended.
When Helen uses her walkie talkie to let Rob talk to Jan via satellite phone, she doesn't hit the mic button.
There are several moments throughout the film where strong winds and snow can be seen in the vicinity of the actors, when the same is not evident in the background scenery.
When the team reaches camp 1 for the first time, the whole team is seen walking there, when Beck and Yasuko should be still in the icefall.
A man in the Nepal airport takes a selfie with a modern Samsung cell phone.
Lukhla Airport's landing strip was still unpaved in 1996. Renovation of the runway, which included asphalt paving, took place after 2000.
The song playing in the Nepal bus (Yeh Ladka Hai Allah) was recorded for the movie Kabhi Khushi Kabhie Gham... (2001), released in 2001.
The Black Diamond tents (Mesa, the orange one and Eldorado, the yellow one) were not yet in production in 1996.
The team is crosses Larja Dhoban, the suspension bridge above the Dudh Koshi river just before the steep climb up to Namche Bazaar. This movie is set in 1996. The new bridge was built in 2013 due to the aging bridge below it.
Multiple crew members are briefly reflected in Rob's glasses.
Shortly after Caroline begins to address everyone in the tent, a crew member can be seen entering through an opening behind her and then disappearing out of sight.
Early in the film, during some quick dialog between Rob and Scott, a man in dark green or black jacket, holding his arms next to his body, is reflected in Scott's sunglasses. Rob is wearing a red jacket, and his arms are resting on some climbing equipment.
When the toilet tent at Base Camp is pointed out, a tourist is reassured that despite the "ventilation", this is the view George Everest would have seen. Everest, Surveyor General of India, never went anywhere near the mountain that was named after him.