Daphne brings two plates of food to the table. In the next shot of the table they're gone, before anyone even starts eating.
Frasier says his father IS 63 years old. This is a January 1994 showing. In season 5 in a September 1997 showing, his father turns 65. So he can't be 63 yet in this one, he wouldn't turn 63 until September 1995, one year and eight months after this showing.
In the last scene, the crowd in the hall mobs Elaine as the elevator doors open. However they would have no idea who this stranger is having only heard vague references about her on the radio.
Dodge never made a "Polaris". The model was called "Polara."
Towards the end of the episode, Marjorie asks, "Well, we've been waiting here for the last fifteen minutes. Did Elaine show up, or did we miss her?" If Elaine had shown up, then by definition, they would have missed her, so this is null question.