Destination Moon (1950)

Factual error: Between Earth and the Moon the crew of the spacecraft have an EVA in which they walk on the ship's metal hull with magnetic boots. At one point an astronaut inadvertently slips both boots off the hull and drifts off into space, helpless. There is a long shot of him drifting away in which his body spontaneously spins around 180 degrees and then stops rotating, which is all a violation of conserved angular momentum.

Factual error: Early on it's made known that the spaceship's hull will be fashioned from Titanium for lightness. Once en route to the Moon, however, the crew make an EVA in which they walk on the hull with magnetic boots. Magnets don't stick to Titanium; it's non-ferromagnetic.

Factual error: After putting the rocket on course for the Moon, the crew relax and have a meal in weightlessness. Barnes is hunched on the floor, in a sitting position, and as he is passed a coffee, he rests his elbow upon his knee, very much as one would do on Earth under body weight. (00:45:15)