When Joey and Tony talk in the kitchen and Tony says, "It says what it says," Joey holds the letter with both hands. In the next shot, he holds it only in his left hand.
The first season established that Blossom was 14 and was 10 when her parents got a divorce, however she is much older than 10 in the flashbacks where her parents are still married. This is because this episode's flashback scenes came from the original pilot in where her parents are still married when she's 14, a plotline which was re-written by the time the show got picked up to series.