Thatcher's speech that says "the men of violence have chosen in recent months to play what may well be their last card" is shown in the film when the hunger strike is beginning, but it was actually made after Bobby Sands had died. It was made on 28th May 1981. Bobby Sands died on 5th May 1981.
Father Dominic Moran refers to "Northern Ireland". Were he to do this, it would likely to have annoyed Bobby Sands. Irish Republicans reject this phrase and intend refer to "the north of Ireland".
Raymond Lohan's Ford Granada is a Mk2 Facelift, which was released in winter 1981 and would've appeared on Irish roads in 1982.