upbringing

We just moved to a new neighbourhood. I was very pleased that my son aged 8 has made a friend of his own age and is spending a lot of time with him, playing outdoors, riding bikes and also going to his house and our house together. I spoke with the childs mom and dad and everything seems fine. But yesterday the kids watched the movie 'Chucky' at their house and my son came home terrified and upset. He was afraid to leave because he thought the other child would laugh at him being afraid of the movie. I had a look at the movie online and dont think its suitable viewing for 8 year olds. My son does not want me to say anything to the other Mom in case she says to his friend that he was scared. The friend is more confident and outgoing than my son. My son and I have agreed that if anything is going on he does not want to participate in that he will just say he wants to go home in future. Any advice? Should I approach the parents? When schools starts I expect there wont be as much time for this kind of thing.