 Brendan OCarroll (qv), 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 (I) (qv) 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.