The actor told US Weekly that his kids, 20-month-old Samuel and 3-year-old Sacha, got along well with Jolie's six children while their parents were shooting the film.
"There were playdates which were amazingly fun!" he said.
"We were playing shoot-ups inside the studio, and [our kids] were having squirt gun fights out in the lot. Everyone got along!"
Schreiber added that he enjoyed working with Jolie and found her to be extremely personable.
"It was great! I didn't know what to expect. I was very impressed with how normal she was, and how easy she was to work with."
Salt is now playing in US cinemas, and will be released in the UK on August 20.