At San Gennaro, Frasier (Kelsey Grammer) 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.
Frasier decides on a whim to hop on a plane going to Mexico. You can't do that without a passport, which he wasn't carrying with him.
Here Niles mentions that Maris is Episcopalian. Early in Season 2, we are told Maris is Roman Catholic. Her Holy Communion is discussed as is her father smoothing things over with the Pope. (A Word to the Wiseguy (1996)) Later in Season 2, Niles mentions that some of her ancestors were killed by Huguenots. (Daphne's Room (1995))