In interviews Charles Vandervaart, Joey Phillips and Izzy Meikle-Small who play William Ransom and Denzell and Rachel Hunter talk about the injury that William has to his arm. Charles said that he almost had sympathy pains because of how realistic the gash was. Joey gave props to the props department because of their use of the pus and Izzy said that the injury was so realistic that it made her sick which she said wasn't good for someone playing a nurse.
When Ian encounters William he says that they met when William came to Fraser's Ridge when Lord John got the measles. However in the show this never happened. Jamie tells John that Ian was out hunting with John Quincy Myers. In the books however Ian was there and helped Claire with Lord John until he too got measles.