Good Will Hunting (1997) - 4 questions

Question: What is the make/model of the car Will's friends give him for his birthday?

Answer: I believe it's a 1971 Chevrolet Nova.

Question: When Will is discovered by the professor, he is solving a math problem using what appear to be stick figures. Is there a branch of mathematics that deals with these stick figures?

Answer: I looked at it and it seems to be a graph-theoretical problem. Graph theory is a branch of mathematics dealing with figures that look like stick figures (which can be interpreted for example as streets connecting cities, and one tries to find the shortest way from one city to another).

Question: There is a scene where they're all sitting, laughing, telling jokes etc. When Minnie Driver tells a joke - for the love of me I couldn't hear it, and I never got to see it again - could someone tell the joke and explain the punchline?

Answer: There are two versions of the joke actually. The original which is found on the DVD and then the made for TV joke. I don't remember how that one goes and it doesn't seem to appear on the DVD I've got, but the original joke is: All right, there's an old couple in bed, Mary and Paddie. They wake up on the morning of their 50th anniversary. Mary looks over and gazes adoringly at Paddie. She's like, "Oh, Jesus, Paddie. You're such a good-looking feller. I love ya. I want to give ya a little present. Anything your little heart desires, I'm goin' to give it to ya. What would you like?" Paddie's like, "Oh, gee, Mary. That's a very sweet offer. Now, in 50 years, there's one thing that's been missing, and, uh, I would like you to give me a blow job. I would like for it." Mary's like, "All right." She takes her teeth out, puts 'em in the glass. She gives him a blow job. Afterwards, Paddie's like, "yeah, geez, now that's what I've been missin'. That was the most beautiful, earth-shattering thing ever! Beautiful, Mary! I love ya! Is there anything that I can do for you?" Mary looks up to him and she goes, [Skylar takes a swig of her drink] "Give us a kiss." [And her drink comes out of her mouth, indicating what would be coming out of Mary's mouth in the joke].

Question: When Will and his friends leave the Harvard bar, he spots the "Michael Bolton clone" and approaches. He pushes the piece of paper with Skylar's phone number against the glass and shouts "do you like apples?" When the other man replies "Yes", Will says "Well, I got her number. How do you like them apples?" Can anyone please tell me what that means?

Answer: "How do you like those apples" is an expression used to denote triumph, like "told you so" or "put that in your pipe and smoke it". Will just adds his own little humorous twist to it.