The driver's ed car that Lulu is driving has just the regular single rear-view mirror on the upper middle of the windshield. A driving instructor's car would have a second mirror on the passenger's side for the instructor to use.
As Lulu is driving and introducing herself to MacGyver, you can see there is nothing behind the back windshield of the car (over over it) except white.
Another Canadian filming giveaway. Canadians use 'washroom' instead of 'restroom'.
When Mac and Lulu are in the "Speakeasy" at the ending of one song, where the white violin is played, the drummer (who can be seen in the background) stops playing before the song ends but the drums can still be heard.