It should not be forgotten that it's an awful lot easier for children to get into trouble these days than it was. Modern signs of "being out of control" that were regarded as perfectly normal behaviour in my day include:
teenagers hanging around on street corners engaged in conversation
children playing football on the pavement outside their houses (on a street with no cars)
children being seen out-of-doors without their parents after dark (which may be as early as 4 in the afternoon at this time of year)
teenagers spending their evenings in aimless chatter rather than meaningless activities(thankfully, middle-aged mums are still allowed to do a bit of aimless gossip)
schoolboys having a scuffle (seen as violence these days- as normal behaviour 30 yrs ago)
For my children's school you might add:
playing on playground equipment during the lunchbreak (only allowed when it is the assigned time for your class+ supervised by the correct assigned teacher)
sitting down on the ground during play
climbing trees
telling the Offsted inspector that you do not enjoy a subject (this one came up recently)
having a medical condition that affects the school attendance record (this is seen as a discipline problem, regardless of how many doctor's letters you produce)
And I may add that my children do not attend some oldfashioned blood-and-thunder academy, but the local council school. When I was at school 30 years ago, I was able to point out obvious mistakes to my teacher- e.g. if the date in the history book was wrong or an innocent pupil had been accused of a misdemeanour My dd is so cowed by the no-talking-back attitude of her school that she thought it unthinkable to say anything when one of her friends had an accident in PE and was quite wrongfully accused of having caused it- the poor girl was not only in a lot of pain, but had the whole school told in assembly that she had been careless and had only herself to blame. My dd saw the whole thing and knew this was unfair, but let it happen, because in her view explaining the situation would mean being disrespectful to an adult. This worries me- how will she be able to protest against injustice later in life?
When her weekly spellings were wrong (the teacher who did them was not very good), my dd would deliberately memorise the incorrect spelling, because the children at her school are taught to believe that correcting a teacher is disrespectful. I am glad I went to school when nobody had this panicky fear of disrespect- my teachers were confident enough to let us express ourselves without instantly fearing they'd lose control.