The working titles for the special were "Legend of the Lost Treasure" and "The Great Treasure Hunt".
This is the first special in which engines sing an original song.
This special will mark the first appearance of the Small Railway and the Thin Clergyman in the television series as well as the first appearances of Donald and Douglas, Daisy, Alfie, Oliver (The Pack), Max and Monty in CGI.
Skiff sings part of the Banana Boat Song.
When Thomas arrives at the Construction Yard, he his humming "Never Overlook a Little Engine".
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