When Five-O find the van owned by kidnapping suspect Ben Tanaka, Danny Williams finds a headband with a large turquoise stone in it. He calls McGarrett, who is with the husband of the kidnap victim, and tells him to ask Mr. Wingfield if his wife owned "an Indian-type headband." McGarrett turns to Mr. Wingfield and asks if his wife owned "a turquoise headband." The description "Indian headband" was much too general to let McGarrett know even if it was an American Indian headband, yet he somehow knew, correctly, that it had a turquoise stone, even though Danny did not tell him this.
The first time that the kidnapper calls the husband of the kidnap victim, the police are unable to get any trace on the call. Shortly thereafter, however, when he and Danny Williams are discussing this in Che Fong's lab, McGarrett comments that the call was made from "a pay phone used a hundred times a day." Because the police do not get a trace on the kidnapper's call until the second time he calls (after this conversation), McGarrett had no way of knowing whether the kidnapper used a pay phone or a private line.