Question: How did the streetcar, phone booths, and vending machines end up in the digiworld?
Answer: We are never told as to how they got there.
Answer: People who built the digital world most likely had them sent there. Gennai tells the kids in the last episode that the streetcar was from San Francisco, and he asked them to take it back for him.
Question: If Angel didn't experience a "Moment of Perfect Happiness" from his night with Darla, why does he go through the same motions he went through from losing his soul before?
Answer: Due to his epiphany, Angel basically had the 'true darkness' he worked so hard to reattain ripped away from him, like his soul was after sleeping with Buffy.
Question: What was with that series finale ending scene? Did Tony die or not? Did they do this to be open for interpretation?
Answer: The ending is purposely ambiguous and open to interpretation. The series creator once said: "There's more than one way of looking at the ending. That's all I'll say." He's also refused to outright explain what the ending meant.
Question: What is the name of the theme song of Roswell? I think it's something called "Here I am", or "I am what I am".
Answer: It's called "Here With Me", performed by Dido. It can be found on her album "No Angel".
Answer: Eustace is a rather two-dimensional antagonist character. He is just a mean-spirited man who takes out his hostilities on a vulnerable dog and resents his wife having adopted him.
raywest ★
I thought the reason had to do with the attention Courage receives from Muriel.