Continuity mistake: During the escape from Pescendaro, the Terminator shoots the T-1000's head and the T-1000's head splits apart. When this happens Doctor Silberman can be seen nervously in the background. The shot then cuts to the Terminator, John and Sarah and then the shot cuts back to the T-1000. However, when the shot cuts back to the T-1000, Doctor Silberman isn't there any more. (01:00:00)
Revealing mistake: When the cop by the vending machine is about to be killed by the T-1000, the back shot of him reveals he's been replaced by an obvious mannequin. His perfectly trimmed hair along the nape is now long and messy, and a long stitch appears along his sideburn and down to the neck.
Continuity mistake: During the truck scene, when the truck has just come off the bridge, notice the sign on the right hand side says "24 hours." Seconds later the sign seems to have mysteriously disappeared.