Factual error: After hiking a thousand miles, she still has incredibly clean boot laces.
Factual error: In the close-up shots as she reaches her destination at the end of the trek you can see streaked highlights in her hair right back to the roots. If she had been trekking for three months they would have grown out quite a long way, given the lack of regular salons in the wilderness.
Continuity mistake: In the first stage of her walk she can't heat water because she has a red gas canister, and the instructions she reads say she needs a white canister. She then buys a white canister at the next store, happy she can then heat her food. But then she is seen cooking with the red canister, which supposedly doesn't work.
Factual error: They claim she only took 92 days to hike the entire PCT trail... which would require hiking around 28 miles a day with no zero days. They show her spending the first month hiking around 10 miles a day... so this is doesn't make sense. They show the wrong trail head location for the PCT. They don't film on the true Northbound trail head location (The border would be in view). They claim Kennedy meadows is only 100 miles in... It's 700 miles in. She camps and sleeps about 5-7 miles in the first hiking day on a lovely clear patch of ground. In reality she would have to set up on a narrow path (right on the trail) uphill, as there would be no place to set up at that little of a distance on the real trail.