Character refers to having lured a dog to its death, in the song La Vie Boheme. No dog is shown, nor is its death. But the song mainly centers on discussing killing the dog.
Mimi throws up from withdrawals in the dark bathroom, you can see it coming when you see her shivering furiously during her song about being without roger About 1hr and 42-43 mins in. I’m not really sure why everyone says no.
Usually homophobic slurs. Some are reclaimed in "La Vie Boheme B," but the middle of "Goodbye Love" has a scene where a character is called a "q***r" derisively.