When the 1939 register was first available I looked at my Dad's family of 4 (mother, father, son & daughter) and could see that the birthdates were all mixed up. Although the actual dates were correct the days and months and years were a complete mix between all 4 of them so notified FindMyPast and they were quickly rectified.
Now however, on being able to see the full household I can see that the occupations are also totally mixed up so my elderly grandmother is an Instrument Maker heavy work and my Dad is listed as doing Unpaid Domestic Duties! - as if! The daughter has the occupation of the next householder on the schedule.
Another email to FindMyPast I think - but it did make me smile.
Pheno