Tommy: You know a lot of people go to college for seven years.
Richard: I know. They're called doctors.
The deer knocks the rear-view mirror off the windshield, however, when the boys are driving down the highway and the car hood flies off, you can see the mirror again, then it's gone and then it's back again.
When Tommy meets his "Stepmother," he says something like "Dad, she's a 10." That's because the actress, Bo Derek, starred in the movie "10" (1980).