- As many noticed, the window was apparently undisturbed and there are no tracks in the grass. No surprises there. Kounosu is the only one on the same side of the theater as Kaitou, and the props master suspects she used the rope because she's in the rock climbing club. But if she really did, she'd have to enter and exit Kaitou's area through one of the other two rooms on his side (at least one of those windows
is open). She didn't use it outside the back wall for reasons Oreki lays out. Alternately, from the lighting room, she also has access to the atrium/stage, and could climb down to the first floor from there. Only Senoue would have been able to see her from the Sound Room. The whole stage and downstairs hall is an enormously suspicious unknown quantity, but it's also blocked off from the scene of the crime.
- A rope strong enough to support the weight of a person is a vital to the writer's prop list, but probably not for obvious reasons.
- By the prop boy's own admission, there is already way more blood in the movie than the writer called for. In fact...
- The script does not appear to specifically mention that the arm was actually severed. It doesn't even state outright that the Kaitou is dead, though that's probably not a rabbit hole worth spelunking if this is a proper mystery.
- Kounosu say she'll get the master key and Senoue goes with her.
Senoue wasn't there when they found the master key but I guess Kounosu mentions it right before leaving to get it, so not as suspicious as I first thought. If anything, it gives Kounosu something of an alibi in that Senoue went with her to retrieve the key, meaning it was probably still there, and not with Kounosu all along.
- The possibility that the writer might have been looking for a seventh actor just throws everything into chaos. That seriously made me go "ARRRGGGH!"
- The writer not choosing the genre and the list of Holmes books she took as a crash course are relevant, and the symbols next to each title look like notes of what she read/skimmed/didn't read. But since I don't know the books, this is a dead end for me. Maybe someone else will have more luck.
- Eru is a the world's cheapest date. Or most expensive. Depends on where you get the chocolates.