I think it was the Governor to the FCU linkage. Been a long time since I saw the film but it stood out when I did the conversion on to the type.
If I hear a posh english bloke in the hangar nowdays i always double check it before flying....
http://www.imdb.com/title/tt0085255/goofs
Factual errors: Cochran sabotages Murphy's Bell jet ranger by removing the cotter pin and loosening the nut on the throttle-control linkage bolt so it can slip out. Aviation bolts are always installed head-end up as a safety precaution to keep the bolt in place should the nut come off.
There are some people out there with far too much free time!
Flash