Corrected entry: Cartagena has a very modern airport (Pedro de Heredia) even when the movie was made.
Corrected entry: When Ralph's car is floating in the river right before the waterfall the whole front of the car swings up and down following the motions of the water. Obviously it's a real light "able to swim" version.
Corrected entry: When Joan and Jack emerge from the river on opposite banks they agree to meet at the hotel. Joan gets there first, and before Jack arrives too the kidnappers guide her to a different place to exchange the map for her sister. When exchange is interrupted by Zolo and his gang, Jack also shows up, although he should have had no idea where the exchange was to take place.