When Danny's limo is rushing to prom, it is a super stretch limo with 5 sections behind the driver's compartment. When it arrives at the prom, it is much shorter, with only 3 sections.
When the main character is driving the cheerleader home in the beginning, his car starts to die while going down the road. In the shot of the speedometer you can clearly see that the car is in park.
During the final dance scene at the Bar Mitzvah a boom mic operator is visible in the background.