The only Halloween episode of the series.
In this episode, having been shot some weeks after 9/11, Joey wears a FDNY t-shirt to mark the efforts of the New York Fire Department in the wake of the attacks.
Lisa Kudrow has cited this as her favorite episode, because it was the first one they shot after 9/11 and people would thank her for still making them laugh in that dark period.
Monica gets the bunny costume for Chandler, stating his favorite book was THE VELVETEEN RABBIT. This is the same book that he gets for Kathy, as a rare first edition, in season 4.
One of the kids that Rachel gives out candy to (Leilani) is actress Emily Osment in an early role.