I think I know what you are talking about. Are you getting to a situation where you are down to, for example, "John" or "Bruce", "Christmas" or "Thanksgiving", and "Pine" or "Spruce" but have no idea which one went "4th" or "6th"? If that happens, most of the time there is a hint that say something to the effect of "The person who bought the Pine tree went before the person who went home for Christmas." Look for a hint with wording such as that, or a hint that uses the values that cross in the center section of boxes.
Hope that makes sense and help. Good luck!