Nice to see, unlike Ancestry, they linked the NAI person record id as well as the household return pdf.
About & Modifications show Findmypast standardised the data and cleaned some erroneous fields such as people married 100 years.
One might hope that during the phased release NAI intend using an algorithm to assist their OCR data QC, so it flags wives or husbands aged under 14 eg a silly 1, and the many N/A's where the OCR has failed to transcribe age, relation to head or religious denomination etc.