McCallisters dont own bathroom locks?
Theyre super wealthy... but they cant afford locks on their bathroom doors?
-Uncle Frank needs to warn Kevin that if he walks in on him, Kevin will never be a real man.
-Peter instructs Kevin to grab his tie from the bathroom....get in and get out.
-Kevin does indeed sneak in and record Uncle Frank in the bathroom.
Everyone involved seems to have an automatic expectation that the bathroom door will not be locked. Uncle Frank even has to pre-warn Kevin and Peter says to do it anyway without a second thought.