Other mistake: During his conversation with the landlord of the pub he ends up staying in, Sergeant Howie makes it clear that he did not intend to stay on Summerisle overnight, that he had been delayed and so needed accommodation. Makes you wonder why he packed his pyjamas. He's wearing them when Britt Ecklund does her famous naked song and dance routine, and they are not new so we know he didn't buy them that day. When he arrived he didn't even think he'd be on Summerisle for more than a few hours - we don't see him with so much as an overnight bag.
Other mistake: Interior Minister Roger Frey advises Commissioner Lebel that all members of the police, military and other security forces attending the ceremonies on the day the Jackal is expected to strike will be issued with lapel badges at the last moment, in case he is going to try to masquerade as one of them. We see hundreds of such people in the next part of the film, including Lebel himself and the CRS private who allows the heavily disguised Jackal through the barricades around the site of the ceremony DeGaulle is due to attend. Only the CRS private wears a lapel badge. Not one of the other police or military officers in attendance is wearing a lapel badge of any kind. (01:58:15)
Other mistake: When Molly heads to the van to kill Harman, we see Charley waiting in the scrub and watching the van, seemingly anticipating the arrival of Molly. But why would he do this? Does he randomly spend several hours watching for the arrival? Bizarre. Why not warn Harman? It's clear by his shock at seeing the dead body of his partner that it's not his intention to get Harman killed to get him out of the way. Seems to be an overhang of a previous plot direction where Charley does maliciously get Harman removed.Sir John Danvers