Misc: In which country was Ferdinand Porsche born?

Questions

Moronic Duo 1: The type of car B&B drove (and wrecked) once, shown during credits too?

Moronic Duo 1: What was on the blackboard that B&B couldn't read after a doctor's visit?

Mostly Classic Movies: Choreographed ultra-violence; 1971 Best Picture Oscar?

Mostly Classic Movies: Gene Kelly, Donald O'Connor, Debbie Reynolds: "greatest movie musical"?

Mostly Classic Movies: Its director wanted to make an "unwatchable" film. To most people, it is.?