I've remembered more absurd infant school rules and routines, from the mid 80s. I think some of these were more about "obedience and compliance training", rather than anything else.
The end of playtime. The bell would be rung, and the whole school would stand "stock still", on pain of missing the next playtime, with a protracted silence, before each class was instructed to go in, one at a time. Anyone who was caught moving or whispering had to make a walk of shame across the playground; and the "miss your play" area was outside the staff room, where you would be seen by the entire school as they went out for their next play. Once when I got done for this, I sneaked out anyway, and got away with it. 😛Another time I was well and truly busted, but as I was so compliant that I was rarely made to miss my play, I actually found it quite exciting.
One of the biggest crimes children could commit was to do something without being told, even if it was something perfectly sensible. One teacher in particular was big on this, and would bark "I didn't say pack away!" if anyone started doing so. And there was an afternoon handwriting lesson in which most of the class was roundly humiliated: that teacher (not my usual one, thankfully) wrote "kitten" on the board, and so did more than half the class. She did a slow Trunchbullesque march round the classroom, throwing people's books on the floor, then she made them stand at the front, and hold them up. Their crime was that they had written "kitten" in their books, before she had actually told us to do so. They then sat down, and she said kindly "and write the word 'kitten'" to the rest of us. Our usual teacher seemed a bit shocked when she heard about this.
Not so much a rule, but I remember overhearing a discussion between two teachers, about one boy (aged 6) who had allegedly weed on another, and what to do about it. They decided to make him write about it; I smiled at the idea of him sitting down to write "I weed on John". The teachers were debating whether he should do it on paper or in his exercise book; they went with on paper, I suppose so that parents wouldn't see it. Of course, he was forbidden to go to the toilet again that day, and they said casually "if he wets himself, too bad".
My year 3 teacher particularly disliked children wearing jumpers tied around their middle, and once made a girl write lines when she kept doing it. This same teacher also had a vendetta against "silly questions", which was a bit of a shock after "never do anything without being told".