When Frank answers the pay phone and has his car
stolen, he quickly runs after the car, steals a
bike and keeps up with the car so he don't die.
At the end of the chase, Frank swings from a bar,
flings himself through a factory window, kicking
through his driver side window, kicking the guy
out of his car through the passenger side door.
The first view, you see him easily flying through
the window as if the window is not up, then the
second view from inside the car you see the driver
side window breaking as he kicks through it.
That's a minuscule slip-up
The real slip-up is that after he kicks through
his driver side window to kick the guy out of
his car, the rest of the movie he has his driver
side window. It's not broken at all.
During the car chase scene, the people chasing
him shoot at him not breaking any windows, and
at the end of the movie when he's trapped on the
bridge, he has a bunch of people shooting at his
apparently bulletproof car, yet still not a single
window breaks. When he drives his car off the
bridge and into the river, he's able to break
through the rear driver side window that was just
bulletproof 2 minutes ago, instead of exiting out
the front driver side window that should already
be broken out from him kicking it in earlier.
Slip-Up: Frank is able to break his bulletproof windows and make them magically reappear!! cool!