(at around 1h 13 mins) The black and white commercial featuring Sarah Jordan wasn't shot specifically for the movie; it is an actual commercial starring Scarlett Johansson.
Robert S. Fiveson, director of The Clonus Horror (1979), brought a copyright infringement suit against DreamWorks and Warner Brothers. The lawsuit cited almost one hundred points of similarity between "Clonus" and this film, and the court ruled that Fiveson made a prima facie case for infringement. Before the case could go to trial, DreamWorks settled with the plaintiffs for an undisclosed seven-figure amount.
Michael Bay drove behind a flatbed truck carrying train wheels on the highway leaving Palmdale, and, noticing how dangerous it looked, was inspired to create a destructive chase scene involving one.
Michael Bay told the actors playing the clones that they were essentially children. "That's why a lot of them have this kind of childish innocence here, and it was something fun for the actors to play."
(at around 1h 25 mins) When the jet bike crashes through the office building, an extra is pushed by the oncoming bike into a glass window. This was completely unscripted; the extra was not a stuntman, and couldn't clear the bike's path fast enough. Fortunately, the special effects crew managed to detonate the explosives to shatter the glass a few seconds early, which, according to Michael Bay, may have saved his life. Miraculously, the man sustained no serious injuries.