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.
The Wicker Man (1973)
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Directed by: Robin Hardy
Starring: Christopher Lee, Britt Ekland, Diane Cilento, Edward Woodward
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Suggested correction: He didn't intend to stay in there but brought them just in case. A good policeman is prepared.
What, he wore his jammies under his uniform "just in case"? He isn't carrying an overnight bag.
Lord Summerisle: Come. It is time to keep your appointment with the Wicker Man.
Trivia: Lindsay Kemp plays Alder MacGreagor, the father of Willow (Britt Ekland). In real life, Kemp was only four years older than Ekland.
Question: Why doesn't Howie try to escape when being carried up to the wicker man?
Answer: What's the use? He's surrounded, he can't fight everyone and there's nowhere for him to run.
He is also a fundamentally religious man and he believes that he is going to die and go to heaven.