The Son of the Sheik (1978)

Other mistake: The opening credits list Tomas Milian, Bo Svenson, Gille Kirsten, etc. Everyone (before and after) by FirstName LastName as customary, except Kirsten Gille.

Sammo

Plot hole: Bo Svenson tranqs himself up by mistake just before the Rome-Dubai flight lands. He then wakes up on the same plane in Hong Kong, and returns to the imaginary Persian Gulf sheikdom that was his original destination, on the same day and before dark. It's not how air travel works.

Sammo

Revealing mistake: During the final chase between the son of the Sheik and the evil oil company henchman, Tomas Milian is replaced on the speedboat by a stuntman wearing a bad wig in some shots, and in other shots by the cutest little puppet that rides the cutest little toy boat. (01:23:00)

Sammo