Movie Goof (continuity error): The stripe on Dougherty's helmet momentarily disappears while he is flying the XRV-1
Movie Goof (factual errors): The Earth as represented in the on-orbit shots is too small if the spacecraft is supposed to be in Low Earth Orbit (approx 200 miles) as would be expected for an orbital laboratory (and Voskhod) mission. The apparent altitude is more like 1000 miles.
Movie Goof (factual errors): The Mediterranean coastline as seen from orbit on several occasions barely resembles the correct geography. Spain is distorted and the Strait of Gibraltar is almost unrecognisable.
Movie Goof (factual errors): The flight surgeon mentions Lloyd had lost 16 lbs but there is no way to weigh someone in a zero G environment.
Movie Goof (continuity error): The rocket used for the XRV launch switches between a Titan IIC (with solid rocket boosters on the side) to a regular Titan II (no boosters) from on the pad to lift-off.
Movie Goof (revealing mistake): When Astronaut Lloyd does his "acrobatics" with the rocket pack, the sunlight is clearly hitting his right side. However, when he makes a 360 turn, the sunlight remains on the right side of his suit no matter what position he is in during the turn.
Movie Goof (factual errors): The Russian Soyuz spacecraft depicted only shows the orbital module. The launch/re-entry and service modules are missing.
Movie Goof (continuity error): The Saturn V service structure disappears and reappears during the launch countdown
Movie Goof (factual errors): A Saturn V rocket would not be necessary for a spacecraft bound for low-Earth orbit. A more preferable choice would have been a Saturn 1B.