ok, to clarify the slip-up known as "red thomas' campaign car"...

time: 36:50

red thomas's campaign car drives by marty.

- there are 2 speakers on the roof.

- the pictures of red on the roof are facing the front and the back of the car

- there is no flag on the antenna

time: 35:58

the car turns the corner, marty watches.

- there is 1 speaker on the roof.

- the pictures of red are now facing the left and right sides of the car

- there IS a flag on the antenna.

THE REASON: the first shot was taken during the eric stoltz shoot. the second shot was inserted after michael j. fox came on board.