In Die Hard, when John jumps off the rooftop, his fall stops at a smaller window, not a office window. Next cut, he's lined up with the big window.
Also, flying through that glass would have cut him up worse than his feet were.
You can also see his rubber "shoes" designed as feet in a lot of the running scenes.
Also, staying with Die Hard, the ambulance is not present in the moving truck when you see the terrorists and Hans walk out of it.
When John is at the digital employee screen looking for Holly, her name changes the way its spelled.
Gennaro, Holly, to Gennero, Holly.
At the ho ho ho now I have a machine gun moment when Hans moves his head, the dead guy closes his eyes.
Also, how dirty his undershirt got from the vent.