Continuity mistake: When Lincoln and Jordan board the trailer with the train axles, both mudflaps of the trailer are branded Manac (Also has a sticker with the brand on the trailer) and are black with white font As the axles start to fall off, the mudflaps become Mack brand and are white with black font.

The Island (2005)
21 continuity mistakes - chronological order
Directed by: Michael Bay
Starring: Ewan McGregor, Sean Bean, Scarlett Johansson, Steve Buscemi, Michael Clarke Duncan, Djimon Hounsou
Visible crew/equipment: At the end of the freeway chase, when Laurent steps out of the passenger side of his car, a camera and several crew members are reflected in the door of an approaching vehicle.
Tom Lincoln: Yes, can you please explain to me why my insurance policy is sitting downstairs on my fucking sofa?!
Trivia: Jordan Two Delta (Scarlett Johansson) sees a poster ad and commercial for Calvin Klein featuring her sponsor "Sarah Jordan". They are really things Scarlett did for CK before she made the movie.
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Chosen answer: It appears to be some sort of cable - it can be seen leading to the bracelet in the shot from above the bed immediately prior to the one where Lincoln unplugs it. Exactly what it does is never revealed, but it seems likely to be some sort of monitoring system, keeping an eye on Lincoln's health through sensors in the bracelet.
Tailkinker ★