Revealing mistake: When Connor and Cameron are trying to save Derek Reese from the police truck, Cameron walks on the Jeep's hood to jump onto the police truck. During her walk, we can see that it isn't Cameron but a stunt double. She doesn't look like Cameron and is a bit taller.
Revealing mistake: "Season 2, Episode 20: To the Lighthouse." When Cameron is firing back at the man on the passenger side of the van coming at her, the man drops the gun in his lap when Cameron shoots him. The very next shot shows the gun tumbling around on the road on the opposite side of where he was shooting.
Revealing mistake: Ep. "Samson and Delilah" - As Cameron flips over the Jeep Cherokee, the smoke coming from the bottom of it is from the cannon used to flip it, the cannon in later shots then disappears, more notably when the camera goes above the Jeep with Sarah crawling out.