The only time Trek was on daily here in the UK (excluding now) was in the mid seventies and the BBCs Christmas Holiday Trek as it was known! Most of us stayed in to watch that every morning before we went out to throw snowballs! I think even back then I noticed the odd BBC ordering of the episodes! With Kirk one day having short greasy hair and wearing his shrunken uniform and later wearing his silky outfit with much longer hair and sideburns and the next day back again!
JB
It’s especially obvious in S1, but even later in S3 you can see times that Kirk has his backup toupee on with a pound of greasy kid stuff holding every strand in place.