Continuity mistake: Roz is at Cafe Nervosa, sitting with Marty, pretending to be his date. In one shot her hand is covering his, in the next shot her hands are in her lap - but in the next shot, her hand is back covering Marty's.
Continuity mistake: Frasier is hiding behind the kitchen counter when Ronee comes in - followed by Marty. Frasier puts his hands, one holding an apple, up on the counter. In the next shot the apple is on the counter, and his hands are draped over each other - without enough time for natural movement.
Continuity mistake: When Martin and Frasier are in Cafe Nervosa and Marty is lecturing his son about eavesdropping, his newspaper moves a few inches, from being on his left to being right in front of him, even though he never touched it.
Answer: Nanny G (Nanette Guzman - played by Laurie Metcaf) has been a children's entertainer for twenty years, and tells Frasier, "Do you know what it's like to play the same character for 20 years?!" The joke is that Kelsey Grammer has been playing Frasier Crane since 1984, when the character first appeared on "Cheers", so Kelsey in real life has been doing just that!
Super Grover ★