National Treasure (2004)
Crew or equipment visible
Errors in geography
This process has a low efficiency, such that a 1 Watt pump diode would produce around 200mW of green light, so these laser pointers have IR filters fitted as standard to prevent hazardous IR from escaping. Removing the filter would allow the laser to emit high levels of IR along with the visible light. Whether or not the IR beam would be coherent enough to trigger the alarm at such a distance is another matter, however.
Incorrectly regarded as goofs
One signature was not added until 1781; the clue was written before then. The writers were going to explain this, but decided this information was unnecessary for the story, so it was left out.