The use of the word MY also suggests that the speaker feels a sense of possession towards the assistant, thus the assistant's departure is seen as a loss of control, not merely a setback to the project as he says. 7. it's an animal urge, Puff. it's nothing to be ashamed of (65)

The word Puff suggests an animal, even if Puff is not an animal -- Puff is being assured that acting like an animal is natural, and not worthy of shame, despite Puff's feelings to the contrary and the ambiguous quality of Puff's name.

8. Remember, when in doubt: don't ever do what you really want to do (69)

This statement goes against the assurances of the naturalness of human behavior and impulses -- go against one's human or animal nature, it suggests, and repress and resist gut instincts. Instead, follow societal dictates and one's own superego.

9. There is nothing that makes you feel dirtier than finally deciding to sell your soul and finding no buyer (76)

After giving up one's morals, and repressing...

Please, if you are from a little person, or rather some achondroplasiac terrorist group... (85)
The irony of this statement suggests a deflation of the cause of the other person in the conversation, as the speaker uses obscure advocacy groups of 'little people' or other obscure causes to put down the passion of the person's cause as a minor form of perhaps PETA-like terrorism.

11. Eat *****, thumbtack dick! (85)

This is an assault on a person's masculinity -- thumbtack dick implies that the man his no physical or mental masculinity, and that he uses his small male appendage as a 'tack' or a pathetic instrument upon the world.

12. Well, at least you have the birds in the trees to twitter at you (96)

An ironic reference to nature, once again -- the birds in the trees signify nature, but nature is trivialized by their twittering.