Apollo 10 was the "dress rehearsal" for Apollo 11...they did everything but land on the moon (supposedly the LM did not have enough propellant to allow for Stafford and Cernan to land and take off from the surface on the moon).
One other piece of trivia...Russian Cosmonauts have a tradition, going back to Yuri Gagarin's flight, of having the transport vehicle for the cosmonauts stop on the way out to the launch pad, and cosmonauts get out and relieve themselves next to the vehicle, then get back in and go to the launch pad. Story has it that Gagarin was so nervous for his flight that he needed to take a leak, had the vehicle stop so he could get out and relieve himself before getting on board Vostok 1 (his suit didn't have a urine collection system, since his flight was only one orbit). Cosmonauts consider it "good luck" to do this.