Several alien animals are seen. It is stated that most of the animals will be returned to their home worlds however, one of the animals is homeless and ends up going with David at the end. Another animal is sick, and one eats a hat containing synthetic fibers. I can't imagine this was a healthy meal.
And adult woman tells a 12 year old boy that he is cute, then asks if a girl has ever told him that. As it turns out, according to the book David meets the woman when she was his age, 12 in 7th grade after returning to 1978. They may be married in 1986.
He tells his brother not to call his dog dumb and he replys with 'well, how about *r-slur*-ed?' This happen at around 4:00, during the film's opening scene.