I have found lots of valuable information and leads over the 25 odd years I have been consulting various censuses. Some of my ancestors were illiterate and some were cheeky so I wonder if the information recorded by and about them in various censuses is accurate. Some of the census collectors may have not have been the sharpest tool in the shed.
There are many and varied spellings for family names, there are women's ages that are not consistent from census to census, some occupations that didn't ring true and there were claims to marriages that hadn't happened. My ancestors may have also had difficulty understanding the questions asked.
Although they are valuable genealogical resources I take some of the information recorded about my ancestors with a grain of salt and try to verify elsewhere the facts(!) recorded on census documents.
Taking a look at Trove today I discovered several articles that discussed responses to various censuses. The examples below demonstrate how easy it is for both intentional and unintentional errors to be made on census returns.