Charlie: I brought your fan mail from the office.
Caroline: Wow, look at all the fans I have.
Charlie: No, it's just one guy. But if he gets out, he wants to meet you.
Richard: Caroline, come on. Remember the deadline?! You've got to draw the strip.
Caroline: I know. I just can't draw.
Richard: I agree, but the public seems to like what you do.
Jane Leeves (Daphne Moon) and David Hyde-Pierce (Niles Crane) cross over in their characters from Frasier.
David would later appear in series 2 as an auditor who bribes Annie for an audition in Cats
Richard: Where are you going?
Caroline: Up to the tower to ring some bells.
This is a reference to Quasimodo, the main character from the novel "The Hunchback of Notre Dame" by the french author Vicor Hugo. Quasimodo was born with physical deformities (for example the infamous hump).