Continuity mistake: After the part when the song mentions the 'toes' of the Landlord's Daughter, there's a bit when a burly bearded man gets behind Willow and bumps his large literal pouch against her rear, performing pelvic thrusts while his hands are kept at the height of his shoulder. Cut (during the song, played continuously) and his hands are joined above his head.
Continuity mistake: During "The landlord's daughter", the protagonists starts to realise something is quite a bit weird once one of the patrons mentions the parts that stand 'at attention'. In the background, Willow's dad walked to the right and is facing away from the crowd, but in the next close-up on Edward Woodward, he's behind him and smoking facing him.
Continuity mistake: In the extended version of the film, in the scene at the police station, Officer McTaggart is reading the letter to Sgt. Howie about the missing girl on Summerisle. There's a photo of the girl included with the letter, which McTaggart holds in his right hand to look at. The next shot is a close up of the photo, which shows it being held in the left hand. The next shot of McTaggart holding the photo again shows the photo in his right hand.