When questioned by McGarrett, the stewardess says that the dead man was in the last row on the right. Aircraft seating is referenced facing forward. Although we see him on our right, he is actually in the far left hand seat.
At the beginning of the show, a Boeing 707 arrives at the HNL airport. We then see the interior of the aircraft, which is consistent with this type of aircraft. However, after the body is found aboard, McGarrett asks the flight attendant how many people were aboard and she responds, "Three hundred." A 707 could not carry this many people.