Roger is trying to give Riana a driving lesson. The scene starts with Roger and Riana sitting in Roger's car with both of them not wearing their seatbelts. Riana starts the car moving while neither her nor Roger are wearing their seatbelts. Just after they pull off we see both Riana and Roger wearing their seatbelts.
At approx 8:05 roger calls the rifle a M25 bolt action rifle. neither the M25 sniper weapon system nor the rifle on the show are bolt action. both are based on the m-14 semi-automatic rifle.
Murtaugh refers to the sniper rifle Riggs finds as an "...M-25 bolt action." The M-25 (an evolution of the M-14/M1A) is a semi-automatic weapon.
When Roger is driving with hid daughter he puts a cup of soup on the dashboard as a test for her smooth operation, When she hits the brakes it falls in his lap. This is the wrong direction and it would have spilled onto the dash not his lap.