In a movie, while showing the explosion of a spacecraft in space, a flash of light is shown along with sound at the same time. What are the errors in this depiction?

There are two errors in this depiction. First, sound cannot travel through space because space is a vacuum and sound requires a material medium for propagation. Therefore, the sound of the explosion cannot be heard. Second, even if a medium were present, light travels much faster than sound, so the flash of light would be seen before the sound is heard. Hence, showing both at the same time is incorrect.