The last public execution by Guillotine in France featured in this film was witnessed by a 17-year-old Christopher Lee on an academic field-trip. No one knew until Lee mentioned it in an interview, and someone approached him with the lone-footage and he confirmed it.
The footage regarding the "yellow angels" and the mostly fatal accidents on the German Autobahn was taken from a 1970s informational video produced by the German motorist association ADAC, which operated the rescue helicopters.