For the scene in the cemetery where Duncan and Connnor meet following the events at the Sanctuary, they originally spoke French because both Paul and Lambert are fluent. During post-production, it was decided to switch the language to Scots Gaelic.
The film's trailer contained many sequences and elements not in the film, including scenes suggesting that the villain Jacob Kell possessed supernatural abilities, and a scene showing Connor and Duncan leaping through a "magical portal." It was later revealed that certain scenes were shot exclusively for the trailer, to make the film look more interesting.
The original trailer featured Connor MacLeod splitting Jacob Kell in two with his sword and becoming two people. This never happened in the film.
In the theatrical version, Methos refers to the Sanctuary as Holy Ground. Many fans were upset that Kell killed Immortals on Holy Ground with no consequences. All references to the Sanctuary as Holy Ground were deleted from the DVD version.