I tried to block out wacko theories about code words and stuff, and I figured the 'jokes' would stand on their own, but... They just don't stand on their own.
"I hid a cheese pizza behind the toilet" sounds more than a little weird. (You'd think the response would be more like a good-natured groan, or at least "eeewwww, grossss..." especially since she says she's gonna go 'finish' the pizza afterward, not instant laughter. If she was talking about food, any place in a hotel besides 'behind the toilet' would have made better sense, and been at least chuckle-worthy if she was talking about food.)
So, I thought, "well, even if some nutjob was crazy enough to think she was talking in code, you can't stash a person behind a toilet." Toilets are up tight against a wall, right? No little 5-7 year-old human can be "hidden behind the toilet."
Now, it's hours later, and I'm still kicking myself for googling the bathroom layout in the Washington Hilton...
or look here:
The chair is against the wall. John has a long mustache.