The Magna-Doodle reads "Clean up the duck feathers in the hallway! Treager". Later on it changes to "I love you man!" and a little cartoon face.
The uncut DVD version of the episode features an extra sub-plot where Rachel starts eating out by herself. She starts to enjoy it so much that she blows off a date with a doctor. Monica later convinces Rachel to change her mind, however the doctor silently rebuffs her when he sees Rachel eating out by herself.
(at around 17 mins) The show on the TV set in Joey's and Chandler's apartment is Mulher Maravilha (1975).
The tune that Ross plays is the opening to Bichin Camaro by the Dead Milkmen. Chandler jokes the song is "bichin".