Umm, I don't know which parts you've done, but possibly. If all of the character's hints in the journal say "IN DEVELOPMENT" and you've seen all the club events, you're at least very likely to have seen it all. There might be a semi-hidden scene here or there, but nothing major anymore, I think. A new update is coming soon though, heh.
Viewing post in Club Detention v0.084 - Halloween update! comments
Like the scenes with Cindy or Bella. If Cindy's affection and corruption are high enough, she'll sometimes interrupt your coffee dates with the girls. And as for Bella on weekends, she'll leave the shop unmanned during the Dusk and you can browse her books, and if you browse the right stuff, you can do naughty things with her in the Bar once it's Night.