Other mistake: At the very end, a plane just sitting at the gate was used to simulate one preparing to leave. The landing gear ground safety pins (with red streamers) were still installed as the engines were started, but the pins have to be removed beforehand to keep personnel clear when the engines are running.
Loomis: You aren't going to hit me again are you?
Grimm: I haven't hit anybody since I was nine.
Loomis: Yeah, but it was me you hit.