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no handrails to prevent people from falling into the ginormous cavern of death
On the second viewing I was trying to look around a bit more and this was something I found really worrying.
Also, when Rey is tripping out/tripping over after coming into contact with Luke's light sabre, I liked the quick glimpse of the Knights of Ren (I am assuming that's who they were). They might feature a lot more in the next film if Ren needs a new posse to run with after the demise of the First Order.
...and, once again, they build their quasi-nazi lair of doom with no handrails to prevent people from falling into the ginormous cavern of death.
Will these people never learn?