After Dick tells Mary about Easter Island, she leans away, laughing. A split second later, we see them from a different angle, but now they are close together, their foreheads touching.
When Dick is explaining about his parents to Mary he tells her his pencil was given to his mother by Babe Ruth. He tells her it has his number on it, number 2. Babe Ruth wore number 3.
Tommy says that by the time they receive the bill for their going-away party, they will be "in another galaxy, thirty trillion miles away." Thirty trillion miles is just over five light-years, which is a little more than the distance to the next closest star to Earth, and well within the Milky Way galaxy, which is 100,000 light-years across and 1,000 light-years thick.