Continuity mistake: As Tom drives out of the parking garage, 'Just Married!' is on the back window of his car. In the very next shot, pulling up to Sarah's parents' home, 'Just Married!' is seen again, but it is written differently than in the previous shot, most noticeably the heart over the letter 'i' disappears. Then when pulling away from the house, the 'Just Married!' is different yet again.
Picture added by Super Grover