In "Desperately Seeking Closure," Martin confuses Frasier and Eddie's birthday. He states Eddie's birthday is May 7th. In "Goodnight Seattle," Ronnie and Martin get married on Eddie's birthday which is given as May 15.
After the first cannon blast, Niles (David Hyde Pierce ) supposedly drops the wedding ring into a dish of pate, which Eddie then eats. However, when the blast is heard and Niles drops the ring, it obviously bounces at least a foot away from the pate dish.