The school bus full of children shown in the kidnapping scene are students of Colegio Aleman (German High School), a private school located outside of Quito chartered by the German government.
Right before the shot of Peter Bowmen stopping his car at the roadblock he is wearing sunglasses. In the very next shot, you can see in the rearview mirror that he is not.
The Polaroid which terry examines with a magnifying glass shows Peter smiling slightly. The picture Alice & Janice look at has his mouth closed in a grimace (the plot makes an issue of why he isn't smiling in the photo).
In the final scene, when the helicopter is returning from the retrieval mission, Meg walks up to greet her husband, and she has a huge fever blister on the right side of her upper lip. Later, in that same scene, the fever blister disappears.