Drive the Porsche
Highlight car "F" in the car select menu. Hold [L] + [R] + [Y] and press [Right]. The "G" car (Porsche) will appear.
Drive the truck
Highlight car "G" (Porsche) in the car select menu. Hold [L] + [R] + [Y] and press [Right]. The "H" car (truck) will appear.
Replay pause
Press [Z] during the replay to pause the sequence.