Other mistake: When walking home from the cinema, Sean says to Bernadette (played by Minnie Driver) "I think your father would be very disappointed to hear that, Minnie". Yes it is Bennie the first time (her character's name), but the second time (ie. the sentence above) is definitely "Minnie".
Circle of Friends (1995)
1 other mistake
Directed by: Pat O'Connor
Starring: Colin Firth, Minnie Driver, Chris O'Donnell, Saffron Burrows, Geraldine O'Rawe
Factual error: At the ball, in 1957, they play Eddie Cochran's "C'Mon Everybody" which wasn't written until 1958.
Bernadette 'Benny' Hogan: You mustn't mess me about. I know I may look like a rhinoceros, but I've got quite a thin skin really.