Sophia Crestani died at an overcrowded party last year.
The workers will be assessed for suspected sulphur dioxide inhalation.
Four life-size animatronics feature in the exhibition alongside 14 giant skeletons.
The two patients have been hospitalised with moderate injuries.
They originally attended due to reports of cannabis use.
Four parked vehicles were hit during the ride.
The restoration included new skylights and refurbished organ.
The name has been pulled into debate due to the Black Lives Matter movement.
He had been missing since Wednesday.