Raphael Kaduri announces that he managed to produce laughing gas out of CO2, Calcium and Sodium. Laughing gas (nitrous oxide) cannot be made from the above materials, but from compounds which contain Nitrogen like ammonia or nitric acid.
When in the truck's front seat, Tamar tells Yaron that she likes him. Surprised, he reacts by rapidly rotating the steering wheel to his right and left. As a result, the passengers are thrown to the right and then to the left - the same direction the truck was turning, instead of the opposite side.
According to the book, Elimelech's last name is Zurkin. In the movie he is called Zorkin.