Two races have never contacted each other, cannot speak each other's language, and cannot possibly have worked out compatible protocols for transmission of data; nonetheless, their computers enable them to communicate over their ships' viewscreens upon first contact.
When a spacecraft is found adrift in space, there is always enough power remaining in it to turn on the lights, artificial gravity, and life support. One or more of these systems is usually on when the heroes board the ship.
Military spacecraft have a light-colored exterior, making them easy to see. Only the Bad Guys ever appreciate the danger of this.
Despite the informed attribute of a Universal Translator or similar plot device, nobody looks or sounds like a dubbed film.
People who live all of their lives in space or on Earth's moon, for example, have no physiological consequences of living in an environment with gravity lower than Earth normal. These include such things as weaker bones and muscles and reduced physical strength.
Cryogenics is depicted simply as lowering the person's body temperature to freezing temperature. People in cryostasis simply look like people sleeping in an empty refrigerated tube. In reality, preparations for cryo-suspension include such things as removing the blood and replacing it with an anti-freeze sailine solution. Also, the body (as well as internal organs) must be submerged in a glycerine-like solution that prevents the water in the rest of your cells from crystallizing. This same solution must be pumped into all of the body cavities to ensure cell coverage and equalize pressure inside and outside the body. All of these things ensure eventual revival to be a tedious, involved, multistep process, not simply opening the tube to awaken the sleeper. It also ensures that cryonic suspension for humans will remain legal only for those declared clinically dead.
The modern Gregorian calendar is the default mode of navigation in time travel.