Since the armour the Knights wore was really made of wool, and the weather conditions in Scotland and England being what they normally are, the actors spent most of the shooting days being very cold and wet. To make matters worse, the hotel where they were staying only had a limited number of baths and hot water. At the end of shooting each day, there was a mad dash to see who could get back to the hotel first, and into some hot water. The Monty Python troupe all seem to agree that they did not enjoy much of the filming experience for this movie.
Sad, conceited fact here: I only live 30 miles from where they shot most of the holy grail. All this time, and I’ve never visted Doune castle, where all the castle scenes were filmed. Apparently, you can buy coconut shells at the gift shop.
(Source: filmtrivia)