Continuity mistake: When Billy pulled the medallion out of the ground, part of the cloth covering it was hanging past his hand, but when he blew dirt off the cloth, the cloth was compactly covering the medallion. Also, the cloth should have had more than some loose dirt on it and the medallion - after buried in the ground for 200 years - should have been dirty and tarnished, not clean. (A cloth covering the medallion would not protect it from soaking rains). (00:23:35)
Continuity mistake: When Billy goes back in time and the boy king Huko unzips his vest, the medallion is hanging at the top of the zipper but was hanging much lower earlier. (The length of the rope changes). (00:31:34)
Continuity mistake: When King Cobra was wearing the medallion, the rope was different - more like leather or suede. The stone also looked green instead of blue. (00:41:10)
