Given their age Terry and in certain cases their ailments [I know Stephen Lewis had documented health issues and his gait when walking in shot looks as if he is in a lot of pain ] were they effectively driven everywhere between takes and set down from the car as close to the location of the shot as possible . As you were at the filming when he was dressed as a Mountie were all the scenes done in a single take or where there occasions when they had to re-shoot the scene several times because of either the actor fluffing their lines or something impinged on the scene . I assume they all had director's style chairs for use during takes but having sat in similar chairs myself they aren't the most comfortable . Having been there I wondered if you'd be happy to share your experiences .
I think they tried to limit what actors were on set at anyone time, so they were called upon from the base camps as and when needed, there was still a lot of hanging around, setting up the shots, as it was all filmed with one camera, the weather changes, natural light and lighting requirements, actors fluffing their lines, background noises, barking dogs were always a problem in Aunties street.
When filming at Aunties there were times when Smiler had several costume changes in one day, so he would be back and forward to wardrobe at the base camp, I think the actor who caused the least amount of retakes was Auntie who always seemed word perfect, a simple thing like not being on the correct spot when going for a take could be a simple reason in having to do it again, all of a sudden a cloud would cover the sun and the lighting was wrong, there maybe a sound problem where one of the audio mikes had moved on the actors body, maybe a vehicle being used was to reflective and they had to sort that out
Yes there was always many chairs for cast to sit in, and always nearby tea,coffee and biscuits plus the dreaded portaloo, it was very long days for the age group of many of the cast and only the one day of each week which was a Saturday, though they did try and schedule it so not all the cast were required all of the time, so they may have two or three days away while other filming was going on.
How it all worked at the studio's I don't know, I expect it was calmer there with less travelling and they would have better control of their environment