Christopher Lloyd and Jeff Conaway were told to repeat the "What does a yellow light mean?" joke until the audience stopped laughing. Marilu Henner and Tony Danza can be seen laughing out of character. Jeff Conaway was also cracking up during filming.
Writer/director James Burrows believes there was almost no episode 'more classic' than Reverend Jim's driving test - "maybe the funniest show I did" - in which the former 'stoner' Jim Ignatowski takes a written exam at the motor vehicle bureau.
Highest rated episode of the series.