When Agnes Browne is having the cucumber slices removed from her face we see her friends laughing. One female friend is seen laughing wearing glasses and immediately again wearing no glasses.
The movie is set in 1967 but the car that Tom Jones uses at the end of the movie to visit Agnes is a 1971 Lincoln Continental.
When the group are are coming out of Clery's department store, the physical bus stops in the distance are still from 1990s. Bus stops were green and oval in shape, whereas in the 60s and 70s they were round and black/cream.