Trivia: When Bumblebee first appears it parks itself in the used car lot beside a yellow Beetle. The yellow Beetle was Bumblebee's original form in the Transformers cartoon series.
Trivia: Before its release, Transformers was voted "Best Summer Movie You Haven't Seen Yet" at the 2007 MTV Movie Awards.
Trivia: During the highway battle towards the end, a small shot shows the Autobots and Decepticons driving in a wide shot of the entire highway. There is an overhead bridge, on which are standing many people with their cars, as they watch the shooting. Michael Bay, in his director's commentary, said that they were Transformers fans who lived in the nearby area.
Trivia: When the meteors containing the Autobots crash to Earth, people are running towards the crash sites to see what's going on. One guy with a video camera is saying something like "This is gonna be a hundred times better than 'Armageddon', I promise!". Of course referring to the movie 'Armageddon', a film also directed by Michael Bay. (01:00:10)
Trivia: When Megatron flies in on Sam, he throws away a silver Mercedes-jeep. Take a close look at the numberplate of the car (slow motion and/or pause definetly required, but allowed for trivia) it reads "Energon", the substance that powers Transformers. (02:02:00)
Trivia: When the Xbox 360 transforms, the sound used is not the normal Transformers sound, but the sound made by the 360 when you turn it on.
Trivia: Director Michael Bay has stated that he decided to make Bumblebee a Chevy Camaro in order to avoid comparisons to Herbie the Love Bug. Indeed, Bumblebee behaves a lot like the Disney movies' Volkswagen Beetle, performing various cheeky actions in the Transformers film reminiscent of Herbie.
Trivia: The "changing sound" that is familiar to all Transformers fans from the TV show, was added to the movie despite opposition from Michael Bay, who wanted a more "robotic" sounding transformation. Hasbro would not license the film unless the director at least stayed true to this one aspect of the TV franchise.
Trivia: According to Michael Bay in the DVD commentary, Optimus Prime's body language was inspired by Liam Neeson.
Trivia: Peter Cullen, the voice of Optimus in the cartoons, was cast as the voice of Optimus in the movie due to public demand, after it was determined that his voice hadn't aged too much. Frank Welker, who voiced Megatron in the original series, was also in the running for this film, but his voice was now too old to fit the character.
Trivia: When Sam kicks Frenzy's head, a "Wilhelm" scream is heard as the little maniac is sent flying into the distance.
Trivia: This is the first time in any Transformers media where Bumblebee couldn't speak normally. Unlike every other time it happened (including every other instance in the Bayverse), this time Bumblebee's voice box was perfectly functional but Bumblebee was following the direct order to not speak.
Chosen answer: There is no reason to think they can't. They simply choose not to. They may feel it's too deceitful.
Actually in this movie (when joining up with bumblebee and the others after they pick up the All Spark) and Revenge of the Fallen, Ironhide uses holographic humans in his cargo bed. Also, Arcee and the twins use holographic drivers at the beginning scene in Revenge of the Fallen.