Bugs and cheats listed below can be replicated on a device without the need of cheat tools.
The description for the gold statue Says "a impressive bronze statue"
At year 30 and 50 when you are awarded additional statues, it refers to all of them as "bronze statues" despite the fact two of them are gold.
If a student goes in an area that can only be accessed with a boat / skis, they may occasionally get "stuck", often until the semester ends (although occasionally they will get unstuck themselves). Creating a way for the student(s) to get back across the water will usually make them move again.
Your event organizer (for spring / autumn events) can be offered to go on an invitation event, causing them to not be at school.
They might also change their clothes right after you ask them to be the event organizer.
That means there is a possible chance that no student body have changed and are ready to participate in a event.
When you unlocked skate, sometimes student can also travel on water when in tracksuit even though it's not winter, they use skateboard (not skate) or even by walking across water.
Right after an event ended, you may see some female students who are wearing blue tracksuit is using their movement items.