Niles incorrectly identifies the wine stain on Frasier's tie as being a Merlot; it is in fact a Cabernet. Ironically, in Season 7's "Whine Club", it is his ability to distinguish Merlot from Cabernet that wins him the coveted post of Corkmaster over Frasier.
At San Gennaro, Frasier spills his cabernet all over his tie. The very next shot his tie is clean, then shifts to stained again. This happens twice, ending up clean as he stands and walks over to Johnny's table.
Next scene (Scene 2 - "Love Among The Ruins") Frasier has his tie spattered again, but it's a smaller stain only in the center of the tie.
On the answering machine message, the flight is given as American Airlines flight #11. This is the flight that producer David Angell was later killed on when it was destroyed, September 11, 2001.
Frasier's dislike of hugging is not without precedent. He makes the statement he 'hates hugging' in the Cheers episode, "Honor Thy Mother".
The Happy Chef's name is Leo in this episode. In "The Adventures of Bad Boy and Dirty Girl (2)", it was Floyd.
This is the first time we learn that Daphne has hyperthyroidism - an overactive thyroid.
While Marty and Frasier are fighting, Marty smashes some plates. The shot changes to the living room with Frasier apologizing and then switches back again. However, now all the smashed crockery has disappeared to be replaced by what looks to be a bowl and a tumbler.
In the closing credits sequence, Noel assumes a broadcast stance, extending the script pages on the far side of the mic. This is the way radio performers actually stood so that any rustling of script pages would not be picked up by the microphone.
When taping the sample show, Niles points the microphone at Roz and then turns it to Frasier. In the next close up shot, the microphone is pointed back at Roz.
Frasier promised Frederick a tour of Microsoft, which would be Microsoft headquarters, located in Redmond, Washington, very close to Seattle.
Frasier says Frederick is 8. Frederick was born November 1989, so at this point in time he should only be 7.
In this episode Niles states that Maris never goes on cruises because of her fear of buffets. However, Maris goes on cruises, in both the Season Three episode "Moon Dance" and the season five episode "Voyage of the Damned".
When Frasier lights the fireplace, if you look to the right of the screen you can see the bird handler's hands giving it the signal to jump to Niles' head.
During Frasier's stalling, Stephanie tells him that she has an early morning flight [from Seattle] to Paris. Presuming that affluent folks take nonstop flights, it would have been an early afternoon flight (2PM or so, Pacific time).
Shortly after Frasier attempts to lift the bird off of Niles' head when it first becomes attached, it is clearly visible that Baby moves her feet to get a better footing.
The book that Martin is reading to Daphne whilst she is sick is none other than The Rose and the Rapier, first mentioned by its author (Deirdre Sauvage) in the Season Three episode "The Adventures of Bad Boy and Dirty Girl (2)".
Frasier tells Niles that he once saw Maris naked in the shower. Since Frasier also saw Daphne in the shower in Season Two's "Daphne's Room", that means he has seen both of Niles' wives naked in the shower. Of course, Niles sleeping with Lilith in Season Five's "Room Service" more-or-less makes up for it.
Niles: (lamenting an opera he's just attended) ...the soprano couldn't hit the E-flat above high-C to save her life.
An operatic soprano's vocal range is from C in the fourth octave (on a piano) to C in the sixth octave (high-C). If she could have hit the E-flat above high-C, she would have been classified as a sopranino, not a soprano.
When Martin asks Niles if he can have a romantic evening with Sherry at Niles' apartment, Martin says Sherry's apartment isn't an option because he's allergic to her cats. However, in "Dad Loves Sherry, the Boys Just Whine," Martin said he and Sherry were spending time at her apartment, and the only problem was that she lived in a fourth floor walk-up which was hard on his hip. He made no mention of her cats.
John Rajeski is actually the name of one of the show's producer's assistants. He appears as a Cafe Nervosa waiter in, "You Can Go Home Again".