Factual error: As Kennith Williams and Bernard Bresslaw approach a notice board on horseback, you can blatently see the road they are on. You can even see the white hazard lines on the road. Apart from anything else, Tarmac wasn't even invented until 1901 yet this episode is set in 1750. (00:12:30)
Factual error: Look out for the War Memorial on the green outside the Reverend Flasher's (Sid James) churchyard: it is dedicated to those who fought in died in World War I (1914-18) and World War II (1939-45). Yet "Carry On Dick" is supposedly sometime in the 1750s.
Factual error: Dick Turpin was executed in 1739, but the Bow Street Runners were not founded until 1749. Kenneth Williams' character repeatedly states he is from the Bow Street Runners.