This is a great topic and discussion. I agree with having as much safety "built-in"
as possible on these venues.
In this AHJ, peach' comments ring very true! It's a VERY political thing! The
people who come up with these ideas see mostly the "profit potential" rather
than some silly nonsense about codes and fire safety.
About a thousand years ago, I actually volunteered to work in a few of these
haunted houses, ...ya know, it was all about the girls way back then.
Anyhoo, in addition to the aspect of fire safety, ...lots and lots of
combustibles around hot lights, ...lots of extension cords running
everywhere and on and on, there was the aspect of what cda mentioned ...of
people getting hurt. Either by tripping on something in the dark spaces,
...running in to and away from those people painted up as monsters,
vampires, "chain saw wielding fiends", etc. etc. I actually saw some girls
pee all over themselves because they were so scared. I also saw some
just completely faint right there on the spot, because a vampire [ actor ],
just reach out of dark place and touch them. EMT's were on the
location and DID check her out, so there are other medical issues to
consider in addition to the ones mentioned above.
One year, in one of the Haunted Houses, they had a low voltage wire
grid installed on both sides of a narrowing hallway, ...dark of course.
When the guide led the group through there, they knew where the
"wire grid" was and stayed in the middle of the hallway. The
group soon learned where the grid was when they went through
the hallway. Their contact with it would make contact with a light
and they would think that they were being shocked. It was very
funny way back then.

Not so much so today!
Aaaaaaaahhhh yes, the good `ol days!
.