On his way to answer the door in Frasier's (Kelsey Grammer) apartment, Niles (David Hyde Pierce) bumps into a lamp and tilts the shade. The shade is straight in the next shot.
Just before Cam's American flag unfurls outside Frasier's apartment, a "click" can be heard and then the sound of the flag dropping down. Since the flag was unfurling outside, those sounds should not have been audible inside.
When Martin says to Frasier: "It's just you and I now", Frasier corrects him saying: "You and me, dad." But actually the grammatically correct version is Martin's, the "I" being the subject and not the object. Fraser's version is grammatically incorrect but often used in informal settings.
Mrs. Moon (Millicent Martin) thinks Daphne (Jane Leeves) is a virgin in this episode and yet in episode 7.23, Something Borrowed, Someone Blue: Part 1 (2000), she quite happily thought Daphne was pregnant.
As it turned out she wasn't pregnant and didn't go through with the wedding, it's plausible that her mother could still think, or hope, she was still chaste.
As it turned out she wasn't pregnant and didn't go through with the wedding, it's plausible that her mother could still think, or hope, she was still chaste.