Factual error: Sarah is claimed to be "ex-SAS" - but the SAS don't have any women. Maybe they will one day, but Post Impact is set in the present day.
Factual error: During an emergency dive drill on the Swordfish, a bowl of dishes is dropped, causing the sonar operator to wince in pain. Unless the transducer was relocated to the interior of the sub, or the operator had overly sensitive hearing, it would not have impacted him so severely.
Factual error: The garage scientists are setting up an experiment. One of the guys goes to tighten the terminals of a battery. He grabs one in each hand and proceeds to tighten them. If he had done that to a real battery he would have gotten the shock of his life. (00:12:00)
Factual error: There is an aerial shot of what appears to be Manchester Oxford Road station in the foreground showing overhead power cables. The caption is 'Manchester 1949', but electrification didn't start until the 60's.
Factual error: You can't paint only part of a wall without creating a contrast. That's why walls are always painted as a whole. The paint job done by Wayans could not possibly blend in with the rest of the wall.
Factual error: After Deni fires the last shot in her pistol, she continues to pull the trigger and the gun continues to click. However, this would not happen in a single-action semi-automatic like the Glock she is firing.