Barbara Castle in the film berates her two male assistants, calling them 'chauvinistic', but feminists did not routinely call men 'male chauvinist pigs' until after the publication of Germaine Greer's The Female Eunuch in 1970.
At least three of the Rover 2000 P6 cars that appear in the film including a Police car, are of the MkII version made from 1970. The rear pillar black vinyl trim and stainless hub caps with the Rover logo would indicate this.
A Triumph Toledo with G reg number plates was shown in one shot. The Toledo was introduced in 1970; the correct model would have been the Triumph 1300. Also a G plate denotes a car registered between 1 August 1968 and 31 July 1969, whereas all the action in the film took place in during three weeks in June 1968.
In the opening titles a caption states that "In 1968 there were 55,000 men employed at Ford's Dagenham Factory", yet in the exchange between Mr Tooley & Barbara Castle, Tooley states that Ford employs 40,000 workers in the whole of the UK.
When Connie and Rita O'Grady return to their co-workers from their first meeting, Rita hands her handbag to Connie to hold while she climbs on a table, gets everyone's attention, then announces loudly, "Everyone out!" She climbs down and shakes hands with co-workers without her handbag (Connie is holding it), then suddenly she has her handbag looped on her shoulder, then it's gone and Connie is holding it again, and we never see Connie hand the handbag back to Rita.
Whilst the interior of Lisa Hopkins' 1600E Mk 2 Cortina was in fairly good shape for a 42 year old car, it was pretty ropey for a brand new car which it would have been at the time the film was set in.