DorianaIs the VIP guest human?
yes (I assume so but you never know in a lateral puzzle…)
clearly not your first rodeo 
If so, H/A/M?
yes to all H/A/F?
Type of museum relevant?
no If so, art? history? natural history? technology? science? other?
n/a to allCould the man have achieved the same thing by running to a different toilet?
not necessarily, and certainly not as effectivelyIs something relevantly hidden in/near the toilet?
no Did the guest forget/lose something in/near the toilet?
noIs the man ever in danger over the course of the puzzle? is the VIP guest? is the museum?
yes to allAre other people relevant besides the guide and the guest?
no (within the scope of the puzzle)Relevant where this happens? When?
yes to bothGalFiskI know this one. Good puzzle!
When I read about this, I immediately thought 'this is the stuff lateral puzzles are made of'SundownerDid the guide enter the toilet?
yes did he operate the toilet facilities?
no flush it? switch on the light?
n/a to bothWould he also done so if he had not lead the guest through the museum?
noDid the tour with the VIP guest take longer than planned?
quite the opposite was it during regular opening hours of the museum?
noIs the guide part of the museum staff?
no is whatever he did in the toilet part of his job?
this would not be considered one of his duties, no would the museum benefit from it? would he?
yes to bothAnything criminal or fishy going on?
yes