You've spotted the 'deliberate' mistake. Robert was baptised Plemonstall in 1778.
I'm confident that I have Samuel on the censuses from 1851 onwards and probably 1841 as well, but I know there was another of the same name living in Norley where our Sam ended up. Ours was born at Little Budworth.
In 1851 aged 21 he was working on Fingerpost Lane as a servant to Elizabeth Lewis, widow,73, farmer of 14 acres. The family stayed on Fingerpost Lane for many years.
I wonder if there was a family connection between Elizabeth and Sam, or was the surname a coincidence? Eliz was born in Norley. I wonder who her husband was, and where from.
In 1841, however, a Samuel of the right age(11) was living with Joseph Lewis and wife Sarah at Crowton. If this is the right Sam perhaps his parents were both dead by this time.