- How does John know that "Bill Clay" is Hans? According to the screenwriter, John was supposed to notice that all of the robbers he comes across have the same watch. However, the scene that introduces this fact had to be cut because one of the shots reveals that their truck does not contain an ambulance (which was written into the movie after this scene was filmed). If you look very closely, you can see that the terrorists all have the same watch, and notice that John reacts to Hans' watch when he takes a cigarette, but it's never actually explained in the finished film.
- The Throw It In! where one of the terrorists positions himself in a concession stand to assemble his weapons, and help himself to some candy. It's funny that he looks around to make sure nobody's watching first, as if nicking a Nestle Crunch is what he's worried about people seeing. But then you realize, the cops are literally about to come through the door he's supposed to be watching, and the last thing any of them wants is to have one of their guys too busy munching on a chocolate bar to shoot back.
- Before The Reveal in With a Vengeance, Simon claims that "all the gold in Fort Knox" couldn't make him stop. Then he robs the Federal Reserve Bank, which contains a substantially larger amount of gold in it.
- In Die Hard, Gruber sees the model of the bridge outside Takagi's office and comments how he loved to put together models as a boy with adherence to exact details. This later is referred to when he says they planned for every conceivable scenario. Guess an estranged cop husband being at the party was inconceivable.
Mc Clane: I got invited to the Christmas party by mistake. Who knew?
- The fight between Holly and John at the start of the film causes Holly to put down her family photo, which ironically keeps her husband's identity a secret long enough to shake things up and very satisfyingly sets up the climax.
- In Live Free or Die Hard, Gabriel insults McClane by calling him "a Timex watch in a digital age". However, it's a borderline accidental compliment if you take Timex's slogan into account: "Takes a licking and keeps on ticking." It's also slight lampshading of the flaws in Gabriel's plans. The main roadblocks in his "fire sale" plan are the things that aren't online, the old-fashioned stuff. That's where the problems typically set in, because McClane is able to get there and slow him down. Gabriel doesn't seem to account for the low-tech stuff.