Panic Room
Scientists loved to debunk this iconic scene in Panic Room. The idea was that the two characters would be set on fire, but the one would "duck" for cover underneath the flames. The flames were produced with propane, but propane is heavier than air. That means that the gas would have immediately went to the ground instead of staying at the ceiling. The physics are totally flawed!
Public Enemies
In order to make the film flow better, the directs of Public Enemies had to fib a few things... For example, the film shows that John Dillinger ends up outliving his counterparts. In reality, the opposite happened. John Dillinger died first in July of 1934, and Pretty Boy Floyd followed him a few months later. Lastly, Baby Face Nelson was killed nearly one month after Floyd's death.