Martin makes a big deal out of how much he paid for Nannette and Frasier's wedding, and mentions that 60 or 70 people came... But in Season 7, Ep 2, Father of the Bride, Frasier mentions that his first wedding was a clandestine affair and that they dashed off to the courthouse.
Frasier's just gone into the kitchen to bring everybody some wine. There's a tray with three wine glasses on the stove. Nanny G trails behind, pours herself a glass, and takes a sip. She then proceeds to come on to Frasier. So as not to get caught up in the moment, Frasier carries the tray out to the great room and puts it on the table. There are now four wine glasses, all of which are empty.