During the filming of the movie, Anjelica Huston was "arrested" on Dublin's Moore Street. She had been convinced by some of the street stall owners to try doing her sales pitch for real. As a joke someone informed the local beat Garda that there was someone selling on Moore Street without a trader's licence. Not recognizing Anjelica Huston, the officer in question detained her. He saw the funny side of it when it was revealed who she was and what she was doing and let her go.
Brendan O'Carroll, the author of the book on which the film is based, appears throughout the film as the drunk character first at the cemetery he is the man who races into the pub for a pint ahead of the Brown cortège, then he is putting up the Tom Jones posters, then he is on the bridge where Agnes and the Frenchman stop on their date and finally the character who asks who the owner of the fancy car is at the end.
Agnes Browne works on a fruit and vegetable stall on Moore Street, Dublin city centre's famous market street. In reality, the market stall scenes were shot on Thorncastle Street, and adjacent Bridge Street, in Ringsend, on Dublin's Southside.