In "Medium" (2008) {Car Trouble (#4.14)} Allison's car breaks and Joe tells her it would cost more to fix it than it's worth, and tries to persuade her into buying a new one. Allison gets upset by the idea and reminds him that it was the first car they bought together and that they brought their daughters from the hospital with it. Now the same car gets totaled after an accident and again Joe tries to reason with Allison that she should get a new car, only this time she reminds him that her father gave her the car when she graduated from college.
In the Medium episode "The Boy Next Door" (S3-E15) young Allison's mother (Peri Gilpin) is complaining about her ex--Allison's father--being late with his alimony payment again. In this episode, the same irresponsible, alienated father gives Allison a new car when she graduates from college as if he's still in her life and financially well off.