Continuity mistake: At the end when Anne and Eddie are sitting on the step talking we can see a man in the background walking towards them wearing a light grey/blue top. As the camera cuts to Anne and then Eddie the man disappears, he doesn't pass them as other people do and he doesn't cross the road.
Revealing mistake: After the spaceship crashes to the Earth, the ambulance rushes the wounded astronauts to the hospital. On the way, a symbiote takes control of one man, and kills the emergency vehicle's driver, causing the van to wreck. The final shot of this wreck when the ambulance takes the last roll and stops on its side, shows the CGI involved with the unnatural movement of the van. (00:03:50)