When Roy Earle leaves Indiana, he's driving a 1937 Plymouth coupe. As he's approaching California, the car is a 1938 (similar to the '37 but shorter, wider grille). Later, it changes back to the '37, then to the '38 again.
When Algernon was fishing on the dock using a window shade spring roller, the fish shown underwater biting his bait was a trout, and the fish he catches and holds up in the next scene is a perch.
When Roy Earle, traveling under an alias, first meets Pa Goodhue at the gas station in the desert, he introduces himself only as "Collins". However, when they meet for the second time after the car accident in Tropic Springs, Pa immediately greets him as "Roy," even though Earle had never offered a first name.
The first morning after Roy arrives in the Camp, he is shaving right before Marie comes in to the cabin. His progress shaving changes between shots. Roy is alternating between shaving the right side and then the left side. Then he's back to shaving the left side, but it hasn't been touched. When Marie comes in, it's almost done, then suddenly it's all clean and dry.
Marie is afraid to return to the cabin she shares with the two men and spends the night in Roy's cabin. She has nothing with her. Roy says he will send for her things in the morning, but in bed she has somehow changed into a nightgown.
When Roy and Marie are traveling at night along highway 395, they witness a lovely sunrise over the Sierras. There are two problems with that though. The part of the sierras shown are far far north of where they would have been. But more importantly, highway 395 is EAST of the sierras so they could have seen only a sunset.
Algernon's fishing exercise produces a bass, catching it from what strongly resembles a small tropical fish aquarium where a 1" zebra fish is seen swimming.
During the chase up Mt. Whitney, the dust from the camera car can be seen kicking up in front of Roy's car and the police motorcycles.
When Roy Earle stops at the gas station in the desert, he asks the attendant for gas and water. The attendant immediately grabs the water hose and removes the radiator cap with his bare hands despite the fact that the engine and cap should have been hot.
During the chase scene up the dirt mountain road, the Foley is the sound of screeching tires on asphalt or concrete.
When Roy gets to the door of the mountain store, a crew member's face and shoulders are reflected in the glass.
Before the chase actually gets to the point where the road starts going up the mountain, some parts of the chase seem to have been filmed on the road to Horseshoe Meadows instead of on Whitney Portal Road.
When Roy is talking to Mendoza at the camp at their first meeting, the shadow of the boom mic is seen in the background between them.
Roy points to the sky and says that a "twinkling" star is Venus, but planets are recognizable because they do not "twinkle."
When Roy meets Red, Red says he can't shake hands because he's been cleaning fish. The next day, Marie tells Roy that Red and Babe spend all their time fishing, but they never catch anything.