One flew out of the Cuckoo's Nest - S3-E13
Other mistake: Nick pulls a pint of Tetly on a hand pump. He pulls it once and fills a pint glass. You need to pull the hand pump at least twice before you can get a pint of Tetly.
Dutch Art and Dutch Courage - S7-E4
Other mistake: At the start just before Michael gets out the car, he puts the handbrake on, but the car carries on moving.
Answer: Easy. He could have got the guitar at any point in his life. As for keeping it in the attic? You're not going to throw out a £1000 guitar any time soon.
Ssiscool ★