If you buy some alcohol from the duty free shop, take it to the guy in the workshop and give it to him. He will now let you have some oil. Go to your office and look at the globe. When you turn it round it squeaks. Use the oil and you can stop that annoying squeakyness. You can also give the guy in the workshop the alcohol to make him talk to you again if you told him to stop smoking and he kicked you out.

If you give the postcard from the airport managers office to the girl in your personal office, you can have some of her pills. If someone sabbotages you and puts bacteria in your coffee (you will notice when your character can't go 5 minutes without running to the loo's) then use the pills.