- All the couples had left their children sleeping in the apartments when they went to dinner. With the exception of the Paynes who had a powerful baby monitor, the others went to check the children periodically.
- The McCanns left the patio door unlocked.
- The twins didn't wake up.
- A number of burglaries (or attempted ones) had taken place in the area.
- Over a number of years, various children had been molested or had found a stranger sitting on their beds.
- Only one hair of the 100 or so found in 5A has been positively identified by nuclear DNA. A number of others have haplotypes that correspond to those of people known to have been in the apartment, although this is not a positive identification. Various other haplotypes do not correspond to anyone for whom the INML had a reference sample.
- The GNR asked numerous people in the vicinity if they'd noticed anything suspicious, but had not asked the individuals if they themselves had been carrying a child during the time period in question.
- The Ocean Club set their missing child protocol in motion.