The first appearance of Peter's beloved deviled ham sandwich. Tim DeKay mentions in a commentary for a later episode he actually dislikes them and had a sort-of deviled tofu sandwich instead and that Tiffani Thiessen refused to even be around either sandwich due to the smell.
The whole letter from Kate found at Grand Central reads: "Dear Neal, Heard you're looking for me. Wish I could explain more but time is not on our side. Know that you're my friend, my only lover. You consume my thoughts. Every day I miss you more, but you need to stop looking. No one can deny what we have, but it's over. Please move on. Kate"