When TC gets out of Magnum's car, he is wearing a red shirt ripped up from the fight at the gym. The viewer can see he is being followed and is taken by Mano's thugs. When Magnum is also grabbed and brought to Mano's house, TC has a new black dress shirt on.
When delivering the painting to get the girls back, Magnum has to climb over the gate to get into the War Memorial. When the kidnapper picks up the painting and leaves in his car you can clearly see the entryway next to the gate is open.
When the kidnapper gets in his car to pick up the painting, as the car pulls away a member of the film crew is reflected in the vehicle's driver's-side rear door window.
The kidnapper has the children locked inside a Civil Defense shelter where the temperature will get so high the children will die if they're not rescued in time. These shelters were created to provide a safe place for people to be in case of a disaster or a nuclear emergency. This raises a serious question: of what use is an emergency shelter if everyone who's inside it will die.