Great movie and along with The Majestic are my two favorite Jim Carrey movies. Many believe the simulation of a dome and controlled environment mimics the flat earth model. Of course we'll never know because they won't let us explore Antarctica and we don't have a rendering of earth from a great distance because everything NASA is complete total bullshit.

When Truman hits the edge of "earth" with his boat and takes a bow before he leaves out the side wall to meet that pretty lady was a great scene. That and when he starts to notice the "actors".