Continuity mistake: When Carter is shot at the very end of the film, his shot gun falls clear of his body. In the following shot as the sea washes around his body, his hand is resting on the gun.
Continuity mistake: When Jack Carter drives up to Cliff Brumby's house, watch the shadow on the window in the background. A shadow of someone appears in the window, disappears for a second, and then re-appears in a different place in the window. (00:46:00)
Continuity mistake: When the woman that Carter has slept with is walking up stairs while nude, the position of the robe she carries changes between shots.
Continuity mistake: The Ford Cortina that Jack Carter drives in the film changes number plates. The first time we see it in the film (tailing Kinnear's Cadillac) its registration number is YBB372H. For the rest of this car's appearances in the film, the licence plate is YBB371H. The front bumper is also missing when Carter first drives to Kinnear's house, and mysteriously reappears before being ripped off in a later scene. (00:24:20)
Continuity mistake: The Land Rover that Kinnear's henchmen drive around in at the start is the same Land Rover that the police arrive in to arrest Kinnear at the end.
Continuity mistake: When Kinnear's house is raided by the police a maroon Humber Hawk is parked facing the house wall when they go in, and facing away when they drag Kinnear out.
Continuity mistake: When Jack enters the pub after arriving in Newcastle he walks past a man with long hair and a beard who looks at Jack. The next shot has Jack walking further into the pub and along the bar. The same man Jack walked past is now sitting at the end of the bar.
Answer: It's a show of sophistication. Working class men in pubs and clubs (north, south, and London) typically drank from beer mugs. By insisting on a thin glass Jack is making a public display, of socially distancing himself from the average beer drinking peers, showing he has refined himself from his working class roots.
This is 180° wrong. Thick pint pots with handles were just becoming fashionable when this was made, by ordering a straight "thin" glass he is opting for traditional over trendy.
This is 100% rubbish. The new design of the dimpled mug glass in the 70s was a continuation of the fluted mugs of the 1920s. Northerners, particularly Yorkshire, preferred their beer in jugs, not straight glasses.
Not true at all: everyone I knew in the 70's and 80's always preferred their beer in a normal "thin" pint glass, not the thick, chunky dimpled things. Rightly or wrongly, we always felt it tasted better from a proper glass.