When Stabler is calling in a BOLO, he reports a Mazda Sentra has been stolen. There's no such thing as a Mazda Sentra. If it's a Sentra, it's a Nissan, but if it's a Mazda, it can't be a Sentra.
After Kenny hi-jacks the car and heads for Montreal, he swerves into a 2-axle straight truck, and the driver responds with a blast of his air horn. Straight trucks rarely have air horns, and the one shown does not.