Interesting question! Nowadays, lots of people have installed surveillance cameras in their homes, but I don't know if it's illegal if they don't inform all visitors that they are being filmed. At least there's likely to be a difference between private use at home, and use in public spaces.
At any rate, in the end, it is revealed that, because of this practice of secretly snooping on Malcolm, the supposed "ideal family" is far from ideal, and they have betrayed his trust in them.
One tape of him is labelled "Curious scratching", which as you say could signal improper interest (or could just refer to the bugs which have infested Malcolm's house and maybe clothes), and in the end it is implied that the wife has a lesbian affair: "Who's Melissa?". So it's very likely they have lots of skeletons in their closets!
Last edited by Richiepiep; Nov 23, 2019 at 04:41 PM.
All the people are so happy now, their heads are caving in.
I'm glad they are a snowman with protective rubber skin.