First Screenshot:
Just a misaligned brush.
Second Screenshot:
In most places, you've made the neon tube come right to the edge of the wall (Top Middle), but in this hallway you've stopped about 16 units from the end(Middle Right).
Third Screenshot:
I'm not sure if this is a misalignment or if you wanted the bridge like this. (The gap). Thought I may as well attach it.
I've played it a few times and I must be getting old or something because my eyes do not like all the neon colours, haha.