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. See more...
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Deliberate "mistake": At the corner of the roof, Sam clutches the statue as he protects the All Spark from Megatron, who then destroys the statue causing Sam to fall. In the overhead shot of Sam falling, as the chopper flies by, we see the All Spark leave Sam's grip and actually fall behind him. Yet, in the next close-up the All Spark is safely held in Sam's arm again.
Continuity: When the SUVs arrive at the Hoover Dam, the lead car pulls up to the curb and the doors open directly in front of the first elevator tower (there are four, which are seen in overhead shots), on its right, with the two Nevada intake towers well ahead of the SUV, on its left. Next close-up, however, as Sam exits the SUV the vehicle is now parked farther up the road, directly in front of the Nevada intake towers to its left and closer to the second elevator tower. Note the yellow pedestrian walkway markings (leading to the Nevada intake towers) the SUV is parked on in the second shot.
Continuity: At Hoover Dam, when the soldiers salute Keller the clock reads 10:00, then as Keller, the soldiers, Maggie and Glen walk away in the background, when Simmons tells Sam that they got off to a bad start the clock reads 11:35, and next shot when Banacheck interrupts it reads 11:43. Also when Simmons talks to Mikaela and Sam the word "Nevada" is gone and it only reads "Time" under the clock. Then when Banacheck says, "Come with me, we'll talk about your car," the word "Nevada" is back under the clock.
Continuity: As we are hearing Prime explaining, "They're a young species, they have much to learn," we see S-Seven's SUVs pull up to the curb at Hoover Dam and the doors open, right beside the vertical guardrail posts with the horizontal beams. In the next close-up, all of the horizontal beams have vanished.
Continuity: When Sam grabs his mom's pink bike, there is nothing in the white basket at the handlebars as he flees from Bumblebee. However, at the start of the shot just before the tire hits the broken concrete, a square pink pillow suddenly appears in the basket, before flying out as Sam flips over.
Continuity: At Bobbie B's, when Sam first opens Bumblebee's driver-side door, the gas pump's white steel guardrail is directly behind him, aligned with the driver's seat, but when all the windows shatter, Bumblebee's front fender is aligned with the guardrail, though Bumblebee has not moved. Same goes for the VW Beetle beside the Autobot.
Continuity: When Bobby B. walks with Ron and Sam to the main used lot, where Bumblebee and the VW Beetle are located, most of the cars opposite Bumblebee and to its side actually change make, color, etc., from the time Ron makes the U-turn, to when all the windows shatter and shots between. Examples are: there is a camper parked in the fifth space which changes to a car; the yellow hatchback behind Sam when he opens the car door changes to a light blue car; and the two blue cars (one with a spoiler) parked beside Jaime, the ostrich, which change to a dark car and yellow hatchback.
Continuity: When Ron and Sam, followed by Bumblebee, make the U-turn in front of Bobby B's and then park, the spinning 'Bobby B. sez...let's talk deals' sign is to the left of the three vintage gas pumps, near the clown. When Bobby B. puts his arm around Sam's shoulder and says, "Sam, your first enchilada of freedom..." the spinning sign is now on the other side of the pumps, where there wasn't a spinning sign previously.
Continuity: When Ron and Sam park in front of Bobby B's, there are three cars parked in front of the three pumps - a white vinyl top, a wagon, and a red car. When Sam says, "You said half a car, not half a piece of crap, Dad," the red car has been replaced with an old blue Plymouth, specifically for the "50-year-old virgin" joke, because the red car is back in following shots.
Continuity: When Prime lifts Mikaela up to Sam's bathroom window, there are two baseballs in acrylic display cases and another object (looks like a vintage camera) on the windowsill (beside the tub). Then when Sam runs to that window and sees the Autobots parked as if it were a "truckstop", all those items disappear and are replaced by two small overturned flowers pots.
Continuity: When Ron (holding a flashlight and lantern) is looking through Sam's bathroom window, saying, "Judy, better call the city. We got a blown transformer...," there is no windowbox under that window, which was there earlier. Yet when Prime says "Ironhide, you know we don't harm humans! What is with you?" the rather large windowbox full of flowers is back up under that bathroom window.